add required video setting

cms/envs/common.py

@@ -34,6 +34,7 @@ MITX_FEATURES = {
     'GITHUB_PUSH': False,
     'ENABLE_DISCUSSION_SERVICE': False,
     'AUTH_USE_MIT_CERTIFICATES' : False,
+    'STUB_VIDEO_FOR_TESTING': False, # do not display video when running automated acceptance tests    
 }
 ENABLE_JASMINE = False