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

[Robert C Jennings]

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

Commit message:
Use snap cli rather than custom snap-tool (LP: #1864252)

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:
  Philip Roche (philroche)
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1864252 in livecd-rootfs (Ubuntu): "preseeded snap installs fail in images"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1864252

For more details, see:
https://code.launchpad.net/~rcj/livecd-rootfs/+git/livecd-rootfs/+merge/379691
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~rcj/livecd-rootfs/+git/livecd-rootfs:bugfix/drop-snap-tool_bionic into livecd-rootfs:ubuntu/bionic.
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