[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:minimal-server-layer-3 into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

FWIW, I did a livefs build, replaced the contents of casper on the impish daily ISO with the stuff from the livefs build and did a basic install test with that ISO and it worked fine.
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/406342
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