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

[James Hunt]

It looks like snappy-go is assuming that there will always be a device_part and hence will always be a hardware.yaml to remove (which is not the case).
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https://code.launchpad.net/~mvo/ubuntu/vivid/ubuntu-core-upgrader/unpack-hardware-yaml/+merge/251607
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