[Merge] lp:~jamesodhunt/upstart/disable-system-bus into lp:upstart

[Stéphane Graber]

The code looks good to me, we should just add one test to confirm that upstart with --disable-dbus won't do anything on SIGUSR1.
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https://code.launchpad.net/~jamesodhunt/upstart/disable-system-bus/+merge/186599
Your team Upstart Reviewers is requested to review the proposed merge of lp:~jamesodhunt/upstart/disable-system-bus into lp:upstart.