[Merge] ~paelzer/ubuntu-seeds/+git/platform:prepare-to-drop-server-ship into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:groovy

[Christian Ehrhardt ]

Hi,
we were asked to prepare for the server-ship (and a few others, but the work arises from server-ship for us) being removed.

That has most changes in the platform seed as ubuntu/server-ship-live is fine (we don't want/need to add packages there) as-is we need to take over what would be demoted somewhere into the supported-* structure of the platform.

While discussing and doing so we have identified some further issues like nowadays non-existing packages and had to adopt to that as well.

Some packages that are retained are no servers but tools, so supported-sysadmin-server to contain these.

In a similar fashion supported-hardware-* holds filesystems, only server had filesystems (and storage) mixed with other packages. Following the common/desktop split this adds supported-hardware-server to hold the server specific FS/Storage bits.

Multiple packages retained belong to high-availability which got an own section in supported-misc-servers but no extra file (not needed, then we'd need 5 more files as well which makes things less useful).

Two more topics formerly associated with supported-misc-servers have been separated as they are owned by different teams.
A small set moved into supported-landscape (as we had to save some from u/server-ship).
And the openstack packages needed a lot of cleanup which now takes place in the separate supported-openstack file.

I've run germinate against old&new content and the result is  a no-op - no demotion/promotion to be expected (other than intended changes for e.g. postgresql).

After this landed we can create a new change to ubuntu seeds dropping server-ship with hopefully no consequences (and if so we can fix them up before the AAs move things). Getting that done soon is better than last minute in the release cycle. I'd hope someone from the team has the time to take a look as these things bit rot quickly and then need rebases&rechecks.

@Jamespage - I have moved and fixed a few openstack things as well, just a few commits at the end of this, but it would be nice if you could look and ack this.
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https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+merge/389947
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