Since f427842b some software releases has been
found to be without pinnsed eggs for GitPython dependency.

/reviewed-on nexedi/slapos!432

/reviewed-on nexedi/slapos!427

See https://www.erp5.com/group_section/forum/No-test-results-rtSJ3H4fpC

/reviewed-on nexedi/slapos!382

stack/slapos.cfg: Add slapos.extension.shared. This extension creates .shared file in software directory as a mark of software that was built with shared feature.

If the version is unpinned, the buildout will fail. It is currently mandatory to
  keep all the eggs pinned.

  Any development environment can se allow-picked-version to true if they were tryting to check
  upgrades of some eggs.

This were already discussed and agreeded and the test already passed:

[20180611-4AD45F1D](https://nexedijs.erp5.net/#/test_result_module/20180611-4AD45F1D)

/cc @jerome @jm 

/reviewed-on nexedi/slapos!363

@vincentB @kazuhiko 

/reviewed-on nexedi/slapos!351

/reviewed-on nexedi/slapos!308

 zc.buildout version up to 2.5.2+slapos012
 slapos.recipe.template version up to 4.3
 slapos.core version up to 1.4.4

( because  allow-picked-versions require all versions to be pinned )

inotifyx does not support Python 3.

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>

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