[Bug 742610] validate: refactor the overrides system.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742610
Bug 742610 depends on bug 741260, which changed state.

Bug 741260 Summary: gstpluginfeature: Properly expose the class.
https://bugzilla.gnome.org/show_bug.cgi?id=741260

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

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