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

[Sebastien Bacher]

Review: Needs Fixing

Thanks, I don't understand enough why so of the existing code was structured the way it is and it would be nice to have comments from jibel or didrocks who might remember details but I tried a local build of the canary image and the output is a bit weird. livecd.ubuntu.minimal.standard.squashfs went from 285M to 326M and our language overlays have different content. I would say we should at least sort that out before merging
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https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/404721
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