Supervisord files of stopped partitions (only those) should be removed,
and those of started partitions should exist.

Create the supervisord configuration file for the partition's processes
on start, and remove it on stop.

Give each supervisor process group its own separate configuration file.

See merge request nexedi/slapos.core!502

The bug was introduced in 57118615 and
was actually removing the main IPv6 of the machine because the
_addSystemAddress function is actually seeing the "tentative" attribute
for the IPv6 address added at boot time.

Instead of forcing prefix to /128 for tap IPv6, use noprefixroute
to avoid the unwanted automatic routing.

The logic was here, but the argument was not registered

       Use the proper way to include Mixin into a portal type

  This value isnt exported anymore

See merge request nexedi/slapos.core!501

   A script was missing and one was accepting wrong parameter

See merge request nexedi/slapos.core!497

Adapt tests accordingly

Adapt the tests to take news and 'status' field into consideration.

Include new 'status' field to be one of 'none', 'green', 'red', 'orange'
or 'unsupported' if news are not supported by the master (e.g. proxy).

Add --news option to include a 'news' field with the raw news.

See merge request !499

  Follow up the change on ComputerPartition.__getinitargs__ that included
  an additional entry.

See merge request nexedi/slapos.core!498

   We can introduce style to prevent page blink blank for a moment.

See merge request nexedi/slapos.core!491

See merge request nexedi/slapos.core!455

See merge request nexedi/slapos.core!478

See merge request nexedi/slapos.core!495

This is no longer guessed on Zope4

this way we can just assert the full page content