[Bug 728368] check: add GstHarness convenience API for unit tests

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=728368
  GStreamer | gstreamer (core) | git

Will Manley <gnome> changed:

           What    |Removed                     |Added
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                 CC|                            |gnome at williammanley.net

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