[Bug 790169] decodebin2: Don't let thread run after unref

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790169

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 363344
  --> https://bugzilla.gnome.org/attachment.cgi?id=363344&action=edit
decodebin2: Don't let thread run after unref

We have a dedicated one-shot thread to handle cleanup of old groups.

While this is a good idea. It's an even better idea to make sure
that thread is *completed* before the decodebin2 element to which
it is related isn't freed/gone.

* There can only be one cleanup thread happening at any point in time.
  If there is already one, we wait for the previous one to finish.
* When shutting down (NULL=>READY) make sure the thread is finished

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