the rpath we set in LDFLAGS is not honored here, but we can ignore this
as rpath is needed on executables and not important on shared objects.

libgfortran.so is a shared object that happens to be executable, so it
appears in our ldd check, but we are not executing it directly so it
should be OK.

prune was not recursive when checking dependencies, for example when we
have for example a shared part for openssl that is used only by a shared
part for curl that is not used, we had to run prune twice, the first
iteration would remove curl and only the second iteration would see that
openssl is not used.

This prune in a loop until nothing is pruned by the last iteration. To
support dry-run, we added a ignored_shared_parts parameter to ignore the
parts that are supposed to be deleted.

See merge request !205

This was in plantuml test, but can be used in other cases where we want
to snapshot test screenshots or images produced by softwares.

See merge request !203

prune was not recursive when checking dependencies, for example when we
have for example a shared part for openssl that is used only by a shared
part for curl that is not used, we had to run prune twice, the first
iteration would remove curl and only the second iteration would see that
openssl is not used.

This prune in a loop until nothing is pruned by the last iteration. To
support dry-run, we added a ignored_shared_parts parameter to ignore the
parts that are supposed to be deleted.

See merge request !193

This was in plantuml test, but can be used in other cases where we want
to snapshot test screenshots or images produced by softwares.

Co-authored-by: Thomas Gambier <thomas.gambier@nexedi.com>

Fixes false negative with ldd checks when not using `SLAPOS_TEST_SHARED_PART_LIST` and other small bug fixes.

See merge request !202

Due race conditions resilience can unlink instances from a "dead" runner0 to relink it later (on the new runner0). We should allow relink if the instances are active.

This would fix resilience takeover in general.

It helps on ignore the failures linked to an incident, during the Administrator Triage.

Define specific columns to use the module more efficitiently.

This is helpfull to allow instances be re-requested and allocated by their respective Slave Instances

if previous test fail to build, compile dir is there for inspection. We
don't want to check binaries in there.

This supports the case where some paths used for shared parts are
symlinks

Empty paths confuse the ldd check, because empty prefix always look
valid, so executables using system libraries will be considered as
valid.

This should prevent such confusing tracebacks when building software fail:

    INFO Finished software releases.
    ERROR:slapos.testing.testcase:Error during request destruction
    Traceback (most recent call last):
      File "parts/slapos.core-repository/slapos/testing/testcase.py", line 615, in _cleanup
	cls.requestDefaultInstance(state='destroyed')
      File "parts/slapos.core-repository/slapos/testing/testcase.py", line 680, in requestDefaultInstance
	cls._instance_parameter_dict)
    AttributeError: type object 'SlapOSInstanceTestCase for ...' has no attribute '_instance_parameter_dict'

This reverts commit 49ec3ece.

That commit revealed that all the rpath check was not effective and that
we have in fact lots of components which use system libraries.

We'll fix rpath on slapos profiles and only then we'll fix this check,
to prevent test failures (even if the test failures show a real problem)

This changes a query like:

    SELECT date FROM user WHERE reported = 1 AND date != '2020-04-13' AND date != '2020-04-12'  AND date != '2020-04-11'  AND date != '2020-04-10'  AND date != '2020-04-09'  AND date != '2020-04-08'  AND date != '2020-04-07'  AND date != '2020-04-06'  AND date != '2020-04-05' AND date != '2020-04-04'  AND date != '2020-04-03'  AND date != '2020-04-02'  AND date != '2020-04-01'  AND date != '2020-03-31'  AND date != '2020-03-30'  LIMIT 1

    EXPLAIN QUERY PLAN ...
    0|0|0|SCAN TABLE user USING COVERING INDEX user_date_reported_index

which took ~3 seconds on a 1.5Go collector.db into:

    SELECT date FROM user WHERE reported = 1 AND (date < '2020-03-30'  OR  date > '2020-04-13')  LIMIT 1

    EXPLAIN QUERY PLAN ...
    0|0|0|SEARCH TABLE user USING COVERING INDEX user_date_reported_index (date<?)
    0|0|0|SEARCH TABLE user USING COVERING INDEX user_date_reported_index (date>?)

which is instant.

See merge request !201

This changes a query like:

    SELECT date FROM user WHERE reported = 1 AND date != '2020-04-13' AND date != '2020-04-12'  AND date != '2020-04-11'  AND date != '2020-04-10'  AND date != '2020-04-09'  AND date != '2020-04-08'  AND date != '2020-04-07'  AND date != '2020-04-06'  AND date != '2020-04-05' AND date != '2020-04-04'  AND date != '2020-04-03'  AND date != '2020-04-02'  AND date != '2020-04-01'  AND date != '2020-03-31'  AND date != '2020-03-30'  LIMIT 1

    EXPLAIN QUERY PLAN ...
    0|0|0|SCAN TABLE user USING COVERING INDEX user_date_reported_index

which took ~3 seconds on a 1.5Go collector.db into:

    SELECT date FROM user WHERE reported = 1 AND (date < '2020-03-30'  OR  date > '2020-04-13')  LIMIT 1

    EXPLAIN QUERY PLAN ...
    0|0|0|SEARCH TABLE user USING COVERING INDEX user_date_reported_index (date<?)
    0|0|0|SEARCH TABLE user USING COVERING INDEX user_date_reported_index (date>?)

which is instant.

This supports the case where some paths used for shared parts are
symlinks

for nexedi/slapos!725

```
RuntimeError: /srv/slapgrid/slappart9/srv/testnode/cxm/inst/test0-0/tmp/soft/503f3967022ee2febfbb1f4cb30c3a0f/parts/theia/node_modules/puppeteer/.local-chromium/linux-722234/chrome-linux/chrome has some not found libraries:
	libX11-xcb.so.1 => not found
	libXcomposite.so.1 => not found
	libXcursor.so.1 => not found
	libXdamage.so.1 => not found
	libXfixes.so.3 => not found
	libXi.so.6 => not found
	libXrender.so.1 => not found
	libXtst.so.6 => not found
	libnss3.so => not found
	libnssutil3.so => not found
	libsmime3.so => not found
	libnspr4.so => not found
	libcups.so.2 => not found
	libXss.so.1 => not found
	libXrandr.so.2 => not found
	libasound.so.2 => not found
	libatk-1.0.so.0 => not found
	libatk-bridge-2.0.so.0 => not found
	libpangocairo-1.0.so.0 => not found
	libpango-1.0.so.0 => not found
	libcairo.so.2 => not found
	libatspi.so.0 => not found
	libgtk-3.so.0 => not found
	libgdk-3.so.0 => not found
	libgdk_pixbuf-2.0.so.0 => not found
```


See merge request !200

See merge request !199

 * xml2dict and dict2xml support the JSON format of parameter dict
 * since xml2dict doesn't support unicode, we convert unicode to str in
getInformation

See merge request !198

 * xml2dict and dict2xml support the JSON format of parameter dict
 * since xml2dict doesn't support unicode, we convert unicode to str in
getInformation