Remove django 1.8 shim

openedx/core/djangoapps/oauth_dispatch/dot_overrides/validators.py

@@ -5,8 +5,8 @@ from __future__ import unicode_literals
 
 from datetime import datetime
 
-import django
 from django.contrib.auth import authenticate, get_user_model
+from django.contrib.auth.backends import AllowAllUsersModelBackend as UserModelBackend
 from django.db.models.signals import pre_save
 from django.dispatch import receiver
 from oauth2_provider.models import AccessToken
@@ -31,17 +31,6 @@ def on_access_token_presave(sender, instance, *args, **kwargs):  # pylint: disab
         RestrictedApplication.set_access_token_as_expired(instance)
 
 
-# TODO: Remove Django 1.11 upgrade shim
-# SHIM: Allow users that are inactive to still authenticate while keeping rate-limiting functionality.
-if django.VERSION < (1, 10):
-    # Old backend which allowed inactive users to authenticate prior to Django 1.10.
-    from django.contrib.auth.backends import ModelBackend as UserModelBackend
-else:
-    # Django 1.10+ ModelBackend disallows inactive users from authenticating, so instead we use
-    # AllowAllUsersModelBackend which is the closest alternative.
-    from django.contrib.auth.backends import AllowAllUsersModelBackend as UserModelBackend
-
-
 class EdxRateLimitedAllowAllUsersModelBackend(RateLimitMixin, UserModelBackend):
     """
     Authentication backend needed to incorporate rate limiting of login attempts - but also