[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:move-live-server-to-layers-3 into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:move-live-server-to-layers-3 into livecd-rootfs:ubuntu/master.

Commit message:
Port live server builds to layers.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/405239

I've been meaning to do this for like three years and in the end I think it makes things quite a bit nicer (particularly around the modules stuff -- instead we just now have a layer that has the kernel installed and so all the modules it needs). I've tested this locally and the resulting image appears to work well.

The fix in lb_chroot_layered involved me learning some things!
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~mwhudson/livecd-rootfs/+git/livecd-rootfs:move-live-server-to-layers-3 into livecd-rootfs:ubuntu/master.
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