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 nexedi/slapos.core!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

this does not depend on the details of the URL

See merge request nexedi/slapos.core!493

   .. on consistency table

See merge request nexedi/slapos.core!489

See merge request nexedi/slapos.core!490

Adding the whole top-level available IPv6 range to the local table
conflicts with tun/tap usage. Instead, add only the IPv6 subranges
actually allocated to a partition.

This was introduced in 081e745e and I don't see how it could have been
useful.

See merge request nexedi/slapos.core!494

    It was used on OrderBuilder_generateUnrelatedInvoiceList but the code dont relies on it anymore.

Only one line is used per document.
Using REPLACE is better than DELETE / INSERT.

No need for a multi column primary key, as only one line is used per object.
This will speed up update of the table.

See merge request nexedi/slapos.core!492

This is no longer guessed on Zope4

this way we can just assert the full page content