[Bug 761906] gsttestclock: add crank method

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761906
Bug 761906 depends on bug 761905, which changed state.

Bug 761905 Summary: gstharness: enable empty harness creation and refactor around this
https://bugzilla.gnome.org/show_bug.cgi?id=761905

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

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