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

[Robert C Jennings]

The proposal to merge ~rcj/livecd-rootfs/+git/livecd-rootfs:bugfix/drop-snap-tool into livecd-rootfs:ubuntu/master has been updated.

Commit message changed to:

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.

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.