[Merge] ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:buildd-bootable/xenial into livecd-rootfs:ubuntu/xenial

[Steve Langasek]

Agreed wrt the todos.

Enabling DNS in a xenial minimal image should only require resolvconf (which is part of ubuntu-minimal, which is not pulled in by the buildd image of course, so you need to add it manually).
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https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/378975
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