Add binding to a specific ip. 
Add error log. 

@rafael @gabriel 

/reviewed-on !256

Solve the problem that `slapos` script is missing from slaprunner ( described in !253 ) by adding `slapos.core` egg explicitly.

/reviewed-on nexedi/slapos!254

Thanks to !158 , in a slaprunner we can use slapos command:
```
$ slapos supply https://lab.nexedi.com/nexedi/slapos/raw/1.0.19/software/erp5/software.cfg slaprunner
```
works fine to supply a software to "current" webrunner, but building this software with `slapos node software` fails with:
```
$ slapos node software
2017-10-03 02:46:33 slapos[29536] CRITICAL slapgrid could not write pidfile /opt/slapos/slapgrid-sr.pid
2017-10-03 02:46:33 slapos[29536] ERROR [Errno 13] Permission denied: '/opt/slapos/slapgrid-sr.pid'
Traceback (most recent call last):
  File "/opt/slapgrid/f496eadc03f1ac5a0ab1e4ae60bbe972/eggs/slapos.core-1.4.1-py2.7.egg/slapos/cli/entry.py", line 300, in run_subcommand
    result = cmd.run(parsed_args)
  File "/opt/slapgrid/f496eadc03f1ac5a0ab1e4ae60bbe972/eggs/slapos.core-1.4.1-py2.7.egg/slapos/cli/command.py", line 50, in run
    return self.take_action(parsed_args)
  File "/opt/slapgrid/f496eadc03f1ac5a0ab1e4ae60bbe972/eggs/slapos.core-1.4.1-py2.7.egg/slapos/cli/slapgrid.py", line 116, in take_action
    setRunning(logger=self.app.log, pidfile=pidfile)
  File "/opt/slapgrid/f496eadc03f1ac5a0ab1e4ae60bbe972/eggs/slapos.core-1.4.1-py2.7.egg/slapos/grid/utils.py", line 155, in setRunning
    write_pid(logger, pidfile)
  File "/opt/slapgrid/f496eadc03f1ac5a0ab1e4ae60bbe972/eggs/slapos.core-1.4.1-py2.7.egg/slapos/grid/utils.py", line 167, in write_pid
    with open(pidfile, 'w') as fout:
IOError: [Errno 13] Permission denied: '/opt/slapos/slapgrid-sr.pid'
```

because slaprunner's web interface also runs software, it's better both `slapos node software` command and the one from slaprunner web interface uses the same pid file so that they do not run in parallel.

This depends on slapos.core!29

/reviewed-on !235

Since using apache-2.4[1] the Include directive will fail if no glob
matches, this switch to new, IncludeOptional[2], available since 2.4, in
order to not fail if no configurations are present.

 [1] 1f7bf3d1
 [2] http://httpd.apache.org/docs/2.4/mod/core.html#includeoptional

/reviewed-on nexedi/slapos!252

Recent versions of OpenSSL refuse to load Romain's key:

  unable to load certificate
  140268475908992:error:0D0E20DE:asn1 encoding routines:c2i_ibuf:illegal zero content:../crypto/asn1/a_int.c:154:
  140268475908992:error:0D08303A:asn1 encoding routines:asn1_template_noexp_d2i:nested asn1 error:../crypto/asn1/tasn_dec.c:609:Field=serialNumber, Type=X509_CINF
  140268475908992:error:0D08303A:asn1 encoding routines:asn1_template_noexp_d2i:nested asn1 error:../crypto/asn1/tasn_dec.c:609:Field=cert_info, Type=X509
  140268475908992:error:0906700D:PEM routines:PEM_ASN1_read_bio:ASN1 lib:../crypto/pem/pem_oth.c:33:

With older versions:

  Certificate:
      Data:
          Version: 1 (0x0)
          Serial Number: 0 (0x0)
      ...
Acked-by: Romain Courteaud <romain@nexedi.com>

On some machines, net:TestDialTimeout never passes and today, Go 1.4 is only
used for bootstrapping, so let's not be more clever than Go devs, who
explicitly state to use make.bash

See also https://github.com/golang/go/issues/18954

  id-store-interval is mandatory now.

See nexedi/erp5@5169f193

Support for HTTPS added. 

@rafael @kirr @gabriel 

/reviewed-on nexedi/slapos!249

We are preparing a new buildout version nexedi/slapos.buildout!12

but until that we can force the default index in profiles

/reviewed-on nexedi/slapos!248

Version up for golang from go1.9.1 to go1.9.2

@rafael @kirr @alain.takoudjou

[ kirr: from https://golang.org/doc/devel/release.html#go1.9.minor

go1.9.2 (released 2017/10/25) includes fixes to the compiler, linker, runtime, documentation, go command, and the crypto/x509, database/sql, log, and net/smtp packages. It includes a fix to a bug introduced in Go 1.9.1 that broke go get of non-Git repositories under certain conditions. See the Go 1.9.2 milestone on our issue tracker for details.

@gabriel says they tested go1.9.2 on Caddy ]

/reviewed-on nexedi/slapos!247

9b5d8262 (v↑ zodbtools (0.0.0.dev4)) added zodburi and in turn ZEO
dependency to neoppod/software-common.cfg because zodburi currently
non-optionally requires ZEO.

However I forgot to notice that if we always pin ZEO to 4.x it will
require `transaction < 2` and this will break neoppod/software-zodb5.cfg
which requires ZODB 5.x and in turn `transaction >= 2`:

	Installing neoppod.
	Version and requirements information containing transaction:
	  [versions] constraint on transaction: 2.1.2
	  Requirement of ZODB==5.3.0: transaction>=2.0.3
	  Requirement of transaction>=2.0.3: zope.interface
	  Requirement of ZEO: transaction<2.0.0
	While:
	  Installing neoppod.
	Error: The requirement ('transaction<2.0.0') is not allowed by your [versions] constraint (2.1.2)

We already have ZODB = 4.x in software-common.cfg and software-zodb5.cfg
overrides it to ZODB = 5.x, but ZEO was left not-overwritten and this
way there becomes conflicting requirement on transaction.

Fix it by also overriding ZEO in software-zodb5.cfg

/reported-and-reviewed-by @jm
/reported-on nexedi/slapos!242 (comment 49754)

Caddy initial version with gowork.cfg

@rafael @kirr 

/reviewed-on nexedi/slapos!244

[golang14] fix TestParseInLocation test: Install package from latest changes on upstream go14 branch

https://github.com/golang/go/commit/4d5426a570c2820c5894a61b52e3dc147e4e7925

golang14 is still failing to build on some server, the commit above fix the
problem on test TestParseInLocation. This is why we install golang14 from upstream go14 branch.

[ kirr: see also relateddiscussion on nexedi/slapos!133 ]

/reviewed-by @kirr
/reviewed-on nexedi/slapos!245

We provide neotest SR which builds current NEO/go together with the
tools which are needed to run the benchmarks.

The SR does not yet provide automated service to run the tests
automatically periodically and to upload the results to ERP5 (all marked
as TODO).

However with present state it provides all the infrastructure for people
to try to run NEO tests in their webrunner: a `neotest` program is
installed in buildout top-level bin/ . One should use it to run the
tests.

An example run output could be seen here:

https://lab.nexedi.com/snippets/258

With benchstat (https://godoc.org/golang.org/x/perf/cmd/benchstat) it can be summarized or compared to another run. Here is e.g. summarization:

```
name                                                                 pystone/s
vifibcloud-onlinenet-hosting-004/pystone                              156k ± 6%

name                                                                 µs/op
vifibcloud-onlinenet-hosting-004/sha1/py/1024B                        1.71 ± 6%
vifibcloud-onlinenet-hosting-004/sha1/go/1024B                        2.26 ±73%
vifibcloud-onlinenet-hosting-004/sha1/py/4096B                        6.39 ± 4%
vifibcloud-onlinenet-hosting-004/sha1/go/4096B                        5.66 ± 2%

name                                                                 us/op
vifibcloud-onlinenet-hosting-004/disk/randread/direct/4K-min          75.7 ± 4%
vifibcloud-onlinenet-hosting-004/disk/randread/direct/4K-avg          95.2 ± 1%
vifibcloud-onlinenet-hosting-004/disk/randread/pagecache/4K-avg       1.84 ± 0%

name                                                                 time/op
vifibcloud-onlinenet-hosting-004/disk/randread/pagecache/4K-min      288ns ± 5%
vifibcloud-onlinenet-hosting-004/disk/randread/pagecache/4K-avg      876ns ± 9%

name                                                                 µs/object
dataset:wczblk1-8
vifibcloud-onlinenet-hosting-004/fs1/zhash.py                         22.2 ±11%
vifibcloud-onlinenet-hosting-004/fs1/zhash.py-P16                     40.6 ±19%
vifibcloud-onlinenet-hosting-004/fs1/zhash.go                         4.00 ±40%
vifibcloud-onlinenet-hosting-004/fs1/zhash.go+prefetch128             5.58 ±24%
vifibcloud-onlinenet-hosting-004/fs1/zhash.go-P16                     3.68 ±88%
vifibcloud-onlinenet-hosting-004/zeo/zhash.py                          626 ±40%
vifibcloud-onlinenet-hosting-004/zeo/zhash.py-P16                    2.17k ± 3%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.py                823 ±17%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.py-P16          2.04k ± 3%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.go                666 ± 9%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.go+prefetch128    138 ±10%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.go-P16          1.96k ± 0%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.py                 1.02k ±71%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.py-P16             3.09k ± 1%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.go                   602 ±29%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.go+prefetch128       213 ±14%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.go-P16             4.66k ± 1%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.py                       326 ±32%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.py-P16                   554 ± 7%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.go                      39.6 ± 7%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.go+prefetch128          24.3 ±18%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.go-P16                   213 ± 6%
vifibcloud-onlinenet-hosting-004/neo/go(!sha1)/zhash.go               42.8 ±13%
vifibcloud-onlinenet-hosting-004/neo/go(!sha1)/zhash.go+prefetch128   24.5 ±19%
vifibcloud-onlinenet-hosting-004/neo/go(!sha1)/zhash.go-P16           70.2 ±62%
dataset:prod1-1024
vifibcloud-onlinenet-hosting-004/fs1/zhash.py                         18.8 ±22%
vifibcloud-onlinenet-hosting-004/fs1/zhash.py-P16                     33.6 ±21%
vifibcloud-onlinenet-hosting-004/fs1/zhash.go                         3.46 ±25%
vifibcloud-onlinenet-hosting-004/fs1/zhash.go+prefetch128             5.36 ±25%
vifibcloud-onlinenet-hosting-004/fs1/zhash.go-P16                     2.56 ±45%
vifibcloud-onlinenet-hosting-004/zeo/zhash.py                          617 ±23%
vifibcloud-onlinenet-hosting-004/zeo/zhash.py-P16                    2.19k ± 1%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.py                717 ±46%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.py-P16          2.02k ± 1%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.go                297 ±14%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.go+prefetch128    130 ±10%
vifibcloud-onlinenet-hosting-004/neo/py/sqlite/zhash.go-P16          1.86k ± 7%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.py                   680 ±61%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.py-P16             4.76k ± 1%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.go                   269 ±13%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.go+prefetch128       178 ± 8%
vifibcloud-onlinenet-hosting-004/neo/py/sql/zhash.go-P16             3.03k ± 1%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.py                       227 ±10%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.py-P16                   654 ± 5%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.go                      32.4 ± 8%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.go+prefetch128          15.5 ±12%
vifibcloud-onlinenet-hosting-004/neo/go/zhash.go-P16                   261 ±12%
vifibcloud-onlinenet-hosting-004/neo/go(!sha1)/zhash.go               24.2 ± 1%
vifibcloud-onlinenet-hosting-004/neo/go(!sha1)/zhash.go+prefetch128   13.9 ±25%
vifibcloud-onlinenet-hosting-004/neo/go(!sha1)/zhash.go-P16            270 ±10%
```

The infrastructure to build Go projects under SlapOS is also introduced along the way
(was applied separetely as nexedi/slapos@1b540151).

Please see details in the individual commit messages. 

/cc @nexedi 

P.S. the results are noisy becuase under regular webrunner I do not have root and cannot run e.g. `cpupower frequency-set -g performance`.

/reviewed-on nexedi/slapos!242