[Merge] ~rcj/livecd-rootfs/+git/livecd-rootfs:feature/snap_cohort_key-xenial into livecd-rootfs:ubuntu/xenial

[Robert C Jennings]

Review: Approve

Brian, I've created a new SRU bug for this feature as it is different in scope from bug #1864252 and I've updated the changelog per your request.
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https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/379689
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