[Merge] lp:~ubuntu-core-dev/ubuntu-release-upgrader/split into lp:ubuntu-release-upgrader

[Ken VanDine]

Review: Approve

All tests that are expected to pass are passing.  Looks good now that the symlinks are fixed up.
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https://code.launchpad.net/~ubuntu-core-dev/ubuntu-release-upgrader/split/+merge/109209
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