[Bug 700600] videomixer: Fix races in caps negotiation and re enable the unit test

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=700600
  GStreamer | gst-plugins-good | 1.x

--- Comment #1 from Thibault Saunier <thibault.saunier at collabora.com> 2013-05-18 19:50:48 UTC ---
Created an attachment (id=244653)
 View: https://bugzilla.gnome.org/attachment.cgi?id=244653
 Review: https://bugzilla.gnome.org/review?bug=700600&attachment=244653

videomixer2: Protect flush_stop_pending with the collectpad stream lock

And make sure to expect a flush-stop after a flush-start

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