[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 #2 from Ramiro Polla <ramiro.polla at collabora.co.uk> 2015-01-19 13:55:00 UTC ---
Added support for multiple threads in the HTTP server. Updated git repo. I
still disabled a few tests that take 10 minutes to reach the hard timeout. The
GES tests aren't running on git HEAD either.

$ gst-validate-launcher --sync --mute -b
"validate.http.transcode.*.vorbis_vp8_1_webm" -b
validate.http.playback.seek_with_stop.mp3_h264_1_mp4 -b
validate.http.playback.seek_with_stop.raw_h264_1_mp4

The results on a box with 4 cores were:
 -j1           Total time spent: 0:37:03.168778 seconds
 -j2           Total time spent: 0:20:21.908862 seconds
 -j4           Total time spent: 0:10:57.954698 seconds
 -j8           Total time spent: 0:06:44.182272 seconds

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