[Merge] lp:~paelzer/ubuntu-seeds/refactor-platform-virt-artful into lp:~ubuntu-core-dev/ubuntu-seeds/platform.artful

[ChristianEhrhardt]

Actually LP can re-target the branch to merge it in, so I did that.
Thanks rbasak to make me aware.
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https://code.launchpad.net/~paelzer/ubuntu-seeds/refactor-platform-virt-artful/+merge/327195
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