Using egg receipe to build it instead of install it manually

See merge request nexedi/slapos!1372

The instance-gitlab-test.cfg.in was removed.
We should test the cfg which used in production,
not a dedicated cfg for testing

See merge request !1368

Add missing libxcb to rpath

This reverts commit ca5ba490.

It's actually a good idea to update our pandas version (0.19.x is
already 7 years old, in one project we recently run into a bug of this
pandas version).

We only need to prepare erp5 with few changes so that it also support
those newer versions. This preperation was done in erp5!1738.

/reviewed-on !1355

using ERP5: nexedi/erp5!1545

See merge request nexedi/slapos!1122

1) stack/erp5/zope-versions.cfg
2) stack/slapos.cfg
3) component/ZODB/buildout.cfg.

and remove stack/erp5/ztk-versions.cfg as we need only small part of it.

stack/slapos.cfg should be listed in the begining of software release extends list.

ERP5 now only supports WSGI

This needs a recent enough erp5, with the following commit:
zopewsgi: configure threads count and large_file_threshold with argparse

We only support wsgi now.

TODO: revert nexedi/slapos.package@63da524b

Only wsgi is supported with Zope 4

haufe.requestmonitoring already supports WSGI and Python3 and seems
used and maintainted.

For ZEO4, this was implemented as a monkey patch in ERP5, but this is
now supported in ZEO5, but not enabled by default.

The setting is only avaiable through ZEO's own ZConfig, but not with
ZODB's <zeoclient> so we also adjust the config to import ZEO and use
ZEO's <clientstorage>.

SIGUSR2 for reopening log files was handled by ZServer and waitress does not
handle signals at all, so we could handle this signal but Zope official
documentation recommends using logrotate `copytruncate`:
  https://zope.readthedocs.io/en/4.7/zopebook/MaintainingZope.html#log-rotation
  https://github.com/zopefoundation/Zope/issues/809

This was using `python` which is not always available

Also re-export package-lock.json for the format from npm we currently
have in theia

See merge request nexedi/slapos!1369

See merge request nexedi/slapos!1322

Compile xdpyinfo for use, in case of debug.

bash tests files (*..bash) was not included to nxdtest.

See merge request nexedi/slapos!1365

Shorten the socket path
Add a promise to check socket