[Merge] ~rcj/livecd-rootfs/+git/livecd-rootfs:bugfix/drop-snap-tool into livecd-rootfs:ubuntu/master

[Robert C Jennings]

Robert C Jennings has proposed merging ~rcj/livecd-rootfs/+git/livecd-rootfs:bugfix/drop-snap-tool into livecd-rootfs:ubuntu/master.

Commit message:
Use snap cli rather than custom snap-tool

snap-tool was added to support a deprecate cohort-key feature of the snap store.
Recent changes in snap assertions have added additional fields which snap-tool
is not retrieving.  This resulted in snap install failures on first boot.

This patch removes snap-tool and returns to using the snap cli.  This ensures
snap downloads will function without odd incompatibilities.

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

For more details, see:
https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/379667
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~rcj/livecd-rootfs/+git/livecd-rootfs:bugfix/drop-snap-tool into livecd-rootfs:ubuntu/master.
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