[Merge] lp:~mvo/ubuntu/vivid/ubuntu-core-upgrader/unpack-hardware-yaml into lp:ubuntu/ubuntu-core-upgrader

[Michael Vogt]

Thanks for the review, lp:~mvo/snappy/handle-hardware-yaml should take care of this on the snappy-go side.
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https://code.launchpad.net/~mvo/ubuntu/vivid/ubuntu-core-upgrader/unpack-hardware-yaml/+merge/251607
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