Squash me

   The successor had been removed and re-added on every request, now it just preserves the call.

   Use a gadget_erp5_page_json_editor rather them gadget_erp5_page_slap_json_form

   Titles were copied and paste

   The string (certificate) dont contains metadata text anymore only the certificate itself.

  Only launch caucase when needed.  Not all tests need
  caucase, this saves a bit the overhead to run it

  This reduces --save from nearly 2 hours to ~20min

See merge request nexedi/slapos.core!577

  Since we are changing erp5_site_global_id, update cache is mantatory be called often

See merge request nexedi/slapos.core!576

This could cause slapos request to hang forever while fetching the
json schema of an SR, and in particular it could cause buildout to
hang forever in instance processing when requesting a sub-instance.

See merge request nexedi/slapos.core!575

See nexedi/slapos.package!187

   This constraint has no impact and you change your environment (ie.: use another memcache server) fix consistency will just break the system.

   This constaint also contains hardcoded values (which is already the setupped) so it dont make much sense keep this constraint around doing nothing.

   The user should be able to eventually change the cloudooo configuration after the setup it w/o change zope.conf.

   Just give some valid default if nothing is set, there is no reason to make things more complex them this, since the cloudooo_url is already setup on site creation.

  Rely on standard ERP5 implementation is enough

  Some values are set on testing environment, so no need to rely on IsLiveTest

See merge request nexedi/slapos.core!573

Also remove support for very old OSes.