[Merge] ~paelzer/ubuntu-seeds/+git/ubuntu:update-libvirt-seeding into ~ubuntu-core-dev/ubuntu-seeds/+git/ubuntu:focal

[Christian Ehrhardt ]

Thanks for the review, with these extra answers for documentation I have pushed the change now.
Setting it to merged.
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https://code.launchpad.net/~paelzer/ubuntu-seeds/+git/ubuntu/+merge/378575
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