[Bug 768577] element: clean up thread pool from gst_task_cleanup_all()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768577

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 331085
  --> https://bugzilla.gnome.org/attachment.cgi?id=331085&action=edit
element: clean up thread pool from gst_task_cleanup_all()

This ensures that all async operations (started from gst_element_call_async())
have been completed and so there is no extra thread running.

Fix races when checking for leaks on unit tests as some of those
operations were still running when the leaks tracer was checking for
leaked objects.

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