[Bug 755999] gstharness: add gst_harness_set_single_segment

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755999
Bug 755999 depends on bug 761931, which changed state.

Bug 761931 Summary: harness: fix the race in blocking push mode
https://bugzilla.gnome.org/show_bug.cgi?id=761931

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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