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

[James Hunt]

Review: Approve

This LGTM. However, since the upgrader is not now removing hardware.yaml, please can you make sure that the hardware.yaml gets removed by snappy (HandleAssets()).
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https://code.launchpad.net/~mvo/ubuntu/vivid/ubuntu-core-upgrader/unpack-hardware-yaml/+merge/251607
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