[Merge] lp:~jamesodhunt/upstart/bug-1357252 into lp:upstart

[Stéphane Graber]

Review: Approve

I suspect there may be some unwanted complications when two jobs share the same cgroup depending on the order they each move between states, but I guess it's a tiny tiny corner case.

The current fix seems sane.
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https://code.launchpad.net/~jamesodhunt/upstart/bug-1357252/+merge/232680
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