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

[Michael Vogt]

The proposal to merge lp:~mvo/ubuntu/vivid/ubuntu-core-upgrader/chainsaw-removal into lp:ubuntu/ubuntu-core-upgrader has been updated.

Description changed to:

As discussed on the g+ call.

This branch removes the inplace upgrade code. Its currently not used
and if we need it again we can resurrect it from the bzr history.

It also simplifies the logic to find what to mount/remount by simply
looking at /writable/cache/system.

I might have missed bits that are no longer needed, not sure. I tested with a empty b partition and it works for me for that. But more real world testing will certainly not hurt :)

For more details, see:
https://code.launchpad.net/~mvo/ubuntu/vivid/ubuntu-core-upgrader/chainsaw-removal/+merge/251778
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