prevents vifib.yml playbook from failing for machines containing offline CPUs

Fixup b3ecd384i (obs/_generic: support bootstrapping with either python2 or python3)

The symbolic link is not suported by re6st compilation (it is totally
removed from the archive)

See merge request !170

Integrate to generic the new bootstraping method from ```obs/slapos```.
Update some egg versions.

Fixup 33f0e91b (obs/_generic: support | in variables)

Use a non-extended ASCII character. Sed needs a single-byte character as
a separator and extended ASCII is sometimes interpreted as a UTF-8
unicode (which is not single-byte).

Remove "dep--" in the directory and software name.
Set a proper version.
Upgrade to buildout 2.7.1+slapos019

Set a proper version.
Upgrade to buildout 2.7.1+slapos019

...for the purpose of a less obscure and more clear code.

The "dropped Olimex Debian images" are supposed to be very old.
Please see nexedi/slapos.package@7c5a2eff (comment 167627)
for a complete discussion of this decision.

See merge request nexedi/slapos.package!169

 * use cp instead of mv so that the original file doesn't disappear and we
can rerun the script
 * osc rm can fail if the package is empty (especially at creation time
of the package)

Use § for sed separator instead of | so that we can have | in variables.

We need | in PACKAGE_BUILD_DEPENDENCIES of fluent-bit

dep--fluent-bit was just a development package with less dependencies

OBS_PROJECT will be by default the branch project of our production
project : home:VIFIBnexedi:branches:home:VIFIBnexedi

Then if everything compile fine on the branch project, we will submit
the package on OBS website.

See https://www.debian.org/doc/manuals/maint-guide/dother.en.html#dirs

See merge request nexedi/slapos.package!164

lunzip is used as a basic example.