Updated the camerabin2 based camera with QtMultimedia changes

Moved it to the separate plugin as the rest of gstreamer based services;
Updated with libqgsttools_p changes;
Implemented QMediaRecorder::status property;
Made gst_photography dependency optional,
it's not always available on desktop;
Added video recording case to auto integration test;
Moved backend implementation into qt namespace

Task-number: QTBUG-26046
Change-Id: Iacfc1a6e263a4c0201d5eb28d04c960b87a230c0
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/gstreamer/camerabin/camerabinlocks.h

@@ -48,11 +48,11 @@
 #include <gst/gst.h>
 #include <glib.h>
 
+QT_BEGIN_NAMESPACE
+
 class CameraBinSession;
 class CameraBinFocus;
 
-QT_USE_NAMESPACE
-
 class CameraBinLocks  : public QCameraLocksControl
 {
     Q_OBJECT
@@ -76,4 +76,6 @@ private:
     CameraBinFocus *m_focus;
 };
 
+QT_END_NAMESPACE
+
 #endif