[Bug 711270] check: add rtpsession test

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=711270
  GStreamer | gst-plugins-good | unspecified

Bug 711270 depends on bug 711269, which changed state.

Bug 711269 Summary: systemclock: Add method to set the default system clock
https://bugzilla.gnome.org/show_bug.cgi?id=711269

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

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