[Merge] lp:~jamesodhunt/upstart/remove-basic-user-sessions into lp:upstart

[Colin Watson]

Review: Approve

Looks better now, though I'd add a comment to control_check_permission explaining that we rely on dbus to limit session bus access to the same user (since this is a little non-obvious if you happen to be just looking at that function).
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https://code.launchpad.net/~jamesodhunt/upstart/remove-basic-user-sessions/+merge/144873
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