[Merge] ~tobijk/livecd-rootfs/+git/livecd-rootfs:bugfix/snap-tool-nonzero-exit into livecd-rootfs:ubuntu/master

[Tobias Koch]

Tobias Koch has proposed merging ~tobijk/livecd-rootfs/+git/livecd-rootfs:bugfix/snap-tool-nonzero-exit into livecd-rootfs:ubuntu/master.

Commit message:
snap-tool: exit non-zero if problem occurred

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

For more details, see:
https://code.launchpad.net/~tobijk/livecd-rootfs/+git/livecd-rootfs/+merge/363321
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~tobijk/livecd-rootfs/+git/livecd-rootfs:bugfix/snap-tool-nonzero-exit into livecd-rootfs:ubuntu/master.
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