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

[Christian Ehrhardt ]

And https://people.canonical.com/~ubuntu-archive/germinate-output/ubuntu.groovy/all+extra for the sake of completeness
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https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/platform/+merge/389947
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