[Merge] lp:~mvo/ubuntu/vivid/ubuntu-core-upgrader/chainsaw-removal into lp:ubuntu/ubuntu-core-upgrader

[Michael Vogt]

Thanks, this is updated now and I did light testing. If it look good otherwise I will do some additional test runs and merge/upload.
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https://code.launchpad.net/~mvo/ubuntu/vivid/ubuntu-core-upgrader/chainsaw-removal/+merge/251778
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