[Merge] ~enr0n/ubuntu-release-upgrader:flatpak-quirk into ubuntu-release-upgrader:ubuntu/main

[Nick Rosbrook]

Nick Rosbrook has proposed merging ~enr0n/ubuntu-release-upgrader:flatpak-quirk into ubuntu-release-upgrader:ubuntu/main.

Requested reviews:
  Brian Murray (brian-murray)

For more details, see:
https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/437680

Add a quirk to prevent auto-removal of flatpak if it is actively used. Also fix setup.py to create a PEP440-compliant version string.
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