Prevent GStreamer from hijacking --help

[thomasfillon]

Gstreamer is overriding command line help message.

This issue has already been circumvented in the timeside-launch script see https://github.com/Parisson/TimeSide/blob/6bc2813a9bfb0e241b87e43925591b17d02597ad/scripts/timeside-launch#L141 but it also appears with django management commands as indicated below.

$ python manage.py timeside-create-boilerplate --help
 Usage:
    manage.py [OPTION...] - GStreamer initialization

  Help Options:
    -h, --help                        Show help options
   --help-all                        Show all help options
    --help-gst                        Show GStreamer Options

In this case the same workaround is not obvious to implement.

See

• https://bugzilla.gnome.org/show_bug.cgi?id=425847
• https://bugzilla.gnome.org/show_bug.cgi?id=549879
• https://github.com/mopidy/mopidy/issues/95
• https://github.com/docopt/docopt/issues/245