[Bug 1878769] [NEW] [SRU] updates to the maas deb2snap package

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Alberto Donato (ack):

The current (1:0.6) maas packages in focal provide transition to the
MAAS snap.

This is currently done by getting maas from "stable/ubuntu-$release" for the default branch (which is currently 2.7).
We want to change this to ensure a consistent behavior, always installing 2.7 even once a new release becomes the default track.

The attached MP implement this, along with a few fixes/cleanups for the current preinst logic.
Specifically, the current package doesn't handle an upgrade from a previous version of the transitional package.


[Impact]
* upgrading to focal currently migrates to the stable/ubuntu-20.04 snap, which is currently 2.7 but will be 2.8 in the future 

[Testcase]
* Install maas on bionic (either from archive or ppa:maas/2.6)
* Upgrade to focal.
* `snap info maas` shows snap installed from `2.7/stable/ubuntu-20.04`

[Regression potential]
* Regression potential is low, aside from the desired change in behavior selecting snap channel the branch prvoides a fix for the case of upgrading the transitional package to a newer version.

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: New

-- 
[SRU] updates to the maas deb2snap package
https://bugs.launchpad.net/bugs/1878769
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