Replaced Video with VideoAlpha.

Now all Video tags and VideoAlpha tags will be handled by VideoAlpha.

common/lib/xmodule/setup.py

@@ -39,7 +39,8 @@ setup(
             "slides = xmodule.backcompat_module:TranslateCustomTagDescriptor",
             "timelimit = xmodule.timelimit_module:TimeLimitDescriptor",
             "vertical = xmodule.vertical_module:VerticalDescriptor",
-            "video = xmodule.video_module:VideoDescriptor",
+            # "video = xmodule.video_module:VideoDescriptor",
+            "video = xmodule.videoalpha_module:VideoAlphaDescriptor",
             "videoalpha = xmodule.videoalpha_module:VideoAlphaDescriptor",
             "videodev = xmodule.backcompat_module:TranslateCustomTagDescriptor",
             "videosequence = xmodule.seq_module:SequenceDescriptor",