There has been a latent bug forever in QtDBus that would make a signal
disconnect actually disconnect too much. The reason is that
disconnectNotify() is called every time a signal is disconnected from
a receiver, but that doesn't mean it was the last connection.
This test checks whether disconnecting from voidSignal() to our test
receiver will also disconnect from exitLoop(). If it does, we'll get a
timeout. I could have implemented it with two receivers, but in the
buggy case, it would always fail first in the timeout verification.
Change-Id: I5766d8a38594eb25e65b304913251303660fad41
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
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