[Bug 743063] validate: launcher: Add option to run tests in parallel

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743063
  GStreamer | gst-devtools | git master

--- Comment #25 from Thibault Saunier <tsaunier at gnome.org> 2015-01-20 14:14:15 UTC ---
Review of attachment 294992:
 --> (https://bugzilla.gnome.org/review?bug=743063&attachment=294992)

As I said in another commit I think we should print the classname of the test
too.

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