Updated to Python3

Added absolute import in both files

lms/djangoapps/discussion/django_comment_client/settings.py

 # pylint: disable=missing-docstring
+from __future__ import absolute_import
+
 from django.conf import settings
 
 MAX_COMMENT_DEPTH = None

lms/djangoapps/discussion/notification_prefs/views.py

@@ -3,7 +3,7 @@
 Views to support notification preferences.
 """
 
-from __future__ import division
+from __future__ import absolute_import, division
 
 import json
 import os