EDUCATOR-1573, add waffle switch

lms/djangoapps/discussion/config/waffle.py

+"""
+This module contains various configuration settings via
+waffle switches for the Discussions app.
+"""
+from openedx.core.djangoapps.waffle_utils import WaffleSwitchNamespace
+
+# Namespace
+WAFFLE_NAMESPACE = u'discussions'
+
+# Switches
+FORUM_RESPONSE_NOTIFICATIONS = u'forum_response_notifications'
+
+
+def waffle():
+    """
+    Returns the namespaced, cached, audited Waffle class for Discussions.
+    """
+    return WaffleSwitchNamespace(name=WAFFLE_NAMESPACE, log_prefix=u'Discussions: ')