[Merge] ~xypron/livecd-rootfs:umount into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Oh wow this has been sitting for a while. Do you understand why the bind mount doesn't work? Should we mount /dev as well? 
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https://code.launchpad.net/~xypron/livecd-rootfs/+git/livecd-rootfs/+merge/431381
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~xypron/livecd-rootfs:umount into livecd-rootfs:ubuntu/master.