[Merge] lp:~stgraber/upstart/upstart-dbus-events into lp:upstart

[Stéphane Graber]

So after an IRC discussion we came to the conclusion that my current DBUS implementation is fine as we want to send those signals to every available bus.

I'll now take care of the other issues.
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https://code.launchpad.net/~stgraber/upstart/upstart-dbus-events/+merge/139726
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