[Bug 765935] ges:tests:validate: Add tests disabling mixing in the default testsuite

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765935

--- Comment #1 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 327211
  --> https://bugzilla.gnome.org/attachment.cgi?id=327211&action=edit
tests:validate: Add tests disabling mixing in the default testsuite

And make the file pep8 compliant

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