[Merge] ~ack/ubuntu/+source/maas:snap-channel-2.7-default into ubuntu/+source/maas:ubuntu/focal-devel

[Alberto Donato]

Alberto Donato has proposed merging ~ack/ubuntu/+source/maas:snap-channel-2.7-default into ubuntu/+source/maas:ubuntu/focal-devel.

Commit message:
Install snap from the 2.7/stable/ubuntu-$release channel by default.

- If currently installed maas is newer than 2.7, install from matching track.
- Rename maas/snap-track debconf var to maas/snap-channel (as the /ubuntu-$release is no longer appended)
- Fix wrong display of "MAAS not currently set up" message
- No-op when upgrading from a previous version of the transitional deb.


Requested reviews:
  Ubuntu Sponsors Team (ubuntu-sponsors)

For more details, see:
https://code.launchpad.net/~ack/ubuntu/+source/maas/+git/maas/+merge/384013
-- 
Your team Ubuntu Sponsors Team is requested to review the proposed merge of ~ack/ubuntu/+source/maas:snap-channel-2.7-default into ubuntu/+source/maas:ubuntu/focal-devel.
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