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

[Nick Rosbrook]

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

Requested reviews:
  Brian Murray (brian-murray)
Related bugs:
  Bug #2036679 in ubuntu-release-upgrader (Ubuntu): "security sources.list needs fixing on upgrade"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2036679
  Bug #2036765 in ubuntu-release-upgrader (Ubuntu): "ubuntu-release-upgrader failed to upgrade snap to track new release"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2036765

For more details, see:
https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/452304

Fix several bugs in ubuntu-release-upgrader. This extends/replaces https://code.launchpad.net/~gunnarhj/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/451815.

To ease review, I purposely left out the pre-build.sh stuff and debian/changelog, because I will do that when I upload.
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