[Merge] ~enr0n/ubuntu-release-upgrader:deb822-v3 into ubuntu-release-upgrader:ubuntu/main

[Nick Rosbrook]

Nick Rosbrook has proposed merging ~enr0n/ubuntu-release-upgrader:deb822-v3 into ubuntu-release-upgrader:ubuntu/main.

Requested reviews:
  Julian Andres Klode (juliank)

For more details, see:
https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/447662

Add deb822 support for ubuntu-release-upgrader. If upgrading from a release without deb822 sources, do a normal upgrade and then migrate to deb822 sources at the very end of the upgrade. If upgrading from a release that is already migrated, use new deb822-aware functions for updating the sources.

NB - I am still working on writing some tests for this stuff, but I wanted to get an early review after doing some manual testing.
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