[Merge] ~paelzer/ubuntu/+source/nova:fix-libvirt-dependency into ~ubuntu-server-dev/ubuntu/+source/nova:master

[James Page]

Agreed - rejecting this merge proposal for now; we'll need to fix this for queens at 18.04
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https://code.launchpad.net/~paelzer/ubuntu/+source/nova/+git/nova/+merge/324778
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