[Merge] lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/add-more-tests into lp:ubuntu/ubuntu-core-upgrader

[James Hunt]

Thanks for reviewing!

The consistency issues stem mostly from the fact that I had removed the functional tests which still need reworking before they can land. However, this branch has been cleaned up now.
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https://code.launchpad.net/~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/add-more-tests/+merge/251571
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