[Bug 789763] appsink: test_query_drain unit test is racy

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789763

--- Comment #3 from Julien Isorce <julien.isorce at gmail.com> ---
Created attachment 364623
  --> https://bugzilla.gnome.org/attachment.cgi?id=364623&action=edit
appsink: fix end condition of query drain handler

I thought it was a problem in the unit test but in the end it was a bug in the
element, see commit message.

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