[Bug 754223] audioencoder-tests: port to use GstHarness

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754223
Bug 754223 depends on bug 754193, which changed state.

Bug 754193 Summary: harness: misc bugfixes
https://bugzilla.gnome.org/show_bug.cgi?id=754193

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

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