[Bug 743719] Changing bin state to NULL fails when there is a locked child which is locked

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743719
  GStreamer | gstreamer (core) | git master

--- Comment #1 from Olivier Crête <olivier.crete at ocrete.ca> 2015-01-29 23:31:01 UTC ---
Created an attachment (id=295784)
 View: https://bugzilla.gnome.org/attachment.cgi?id=295784
 Review: https://bugzilla.gnome.org/review?bug=743719&attachment=295784

bin: Ignore failures from state locked elements when going to NULL

Also add a small unit test for locked state behavior

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