[Merge] lp:~mvo/ubuntu/vivid/ubuntu-core-upgrader/more-tests-tweaks into lp:ubuntu/ubuntu-core-upgrader

[William Grant]

The prereq seems to have been rebased (r13 here and r15 in the prereq seem suspiciously identical).
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https://code.launchpad.net/~mvo/ubuntu/vivid/ubuntu-core-upgrader/more-tests-tweaks/+merge/251626
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