Merge pull request #1255 from edx/han/video_cdn_url

Adding EDXAPP_VIDEO_CDN_URL

playbooks/roles/edxapp/defaults/main.yml

@@ -507,6 +507,8 @@ lms_env_config:
   <<: *edxapp_generic_env
   PAID_COURSE_REGISTRATION_CURRENCY: $EDXAPP_PAID_COURSE_REGISTRATION_CURRENCY
   SITE_NAME:  $EDXAPP_LMS_SITE_NAME
+  EDXAPP_VIDEO_CDN_URL:
+    CN: "http://example.com/edx/video?s3_url="
   CODE_JAIL:
     # from https://github.com/edx/codejail/blob/master/codejail/django_integration.py#L24, '' should be same as None
     python_bin: '{% if EDXAPP_PYTHON_SANDBOX %}{{ edxapp_sandbox_venv_dir }}/bin/python{% endif %}'