[Bug 719733] tests: fix memory leak, free test's thread pool

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719733
  GStreamer | gst-rtsp-server | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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   Target Milestone|1.2.0                       |1.2.3

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