Comment 4 for bug 1366534

We use a hack in Ubuntu to stop the D-Bus daemon when the greeter quits [1] which probably cleans up most hangers-on. Logind is supposed to do a better job of this, but I'm not sure if we should be calling Terminate() in logind to force the session to clean up (GDM doesn't appear to do this).

[1] http://bazaar.launchpad.net/~lightdm-team/lightdm/trunk/view/head:/debian/lightdm-greeter-session