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

[Christian Ehrhardt ]

Great everything ready then and far enough away from beta freeze.
I'll land this on late Sunday or early Monday taking a snapshot of [1][2]. If there happen to be new mismatches or demotions added I'll prep changes to clean those up.

Also while everyone said "server-ship isn't used anymore" doing it will be the only thing that proves it for real :-)

[1]: https://people.canonical.com/~ubuntu-archive/component-mismatches-proposed.html
[2]: https://people.canonical.com/~ubuntu-archive/component-mismatches.html
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