[Bug 40001] gibber: Remove broken tests and dependency on xmldiff

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40001

Bug 40001 depends on bug 34255, which changed state.

Bug 34255 Summary: Could I have telepathy group permissions?
https://bugs.freedesktop.org/show_bug.cgi?id=34255

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

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