[Merge] lp:~jamesodhunt/upstart/event-prefixes into lp:upstart

[Steve Langasek]

Review: Needs Fixing

As discussed on upstart-devel, I think the changes to init/* should be dropped altogether, and this functionality should be confined to extra/upstart-event-bridge.c.
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https://code.launchpad.net/~jamesodhunt/upstart/event-prefixes/+merge/146822
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