[Merge] ~tobijk/livecd-rootfs/+git/livecd-rootfs:feature/snap-tool-prefer-stable-for-core into livecd-rootfs:ubuntu/master

[Tobias Koch]

Tobias Koch has proposed merging ~tobijk/livecd-rootfs/+git/livecd-rootfs:feature/snap-tool-prefer-stable-for-core into livecd-rootfs:ubuntu/master.

Commit message:
snap-tool: prefer 'stable' channel over 'stable/ubuntu-X.X' for core snaps
    
When the "snap-tool" script encounters a core snap it will switch to
the "stable" channel if the channel was set to "stable/ubuntu-X.X". This
ensures that core snaps always come from one canonical source.

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

For more details, see:
https://code.launchpad.net/~tobijk/livecd-rootfs/+git/livecd-rootfs/+merge/364800

I would like to propose this change to partially mitigate the problems discussed in bug 

https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1820840
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~tobijk/livecd-rootfs/+git/livecd-rootfs:feature/snap-tool-prefer-stable-for-core into livecd-rootfs:ubuntu/master.
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