INCR-407 python3 compatibility

common/djangoapps/student/management/commands/manage_user.py

@@ -3,6 +3,8 @@ Management command `manage_user` is used to idempotently create or remove
 Django users, set/unset permission bits, and associate groups by name.
 """
 
+from __future__ import absolute_import
+
 from django.contrib.auth import get_user_model
 from django.contrib.auth.hashers import is_password_usable
 from django.contrib.auth.models import Group

common/djangoapps/student/management/commands/set_staff.py

@@ -1,4 +1,5 @@
-from __future__ import print_function
+from __future__ import absolute_import, print_function
+
 import re
 
 from django.contrib.auth.models import User