Merge pull request #15766 from edx/bmedx/ratelimit_upgrade_PLAT-1633

Upgrade django-ratelimit-backend to Django 1.11

common/djangoapps/student/admin.py

@@ -1,13 +1,13 @@
 """ Django admin pages for student app """
 from config_models.admin import ConfigurationModelAdmin
 from django import forms
+from django.contrib import admin
 from django.contrib.admin.sites import NotRegistered
 from django.contrib.auth import get_user_model
 from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
 from django.utils.translation import ugettext_lazy as _
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
-from ratelimitbackend import admin
 
 from student.models import (
     CourseAccessRole,

common/djangoapps/track/admin.py

@@ -2,7 +2,7 @@
 django admin pages for courseware model
 '''
 
-from ratelimitbackend import admin
+from django.contrib import admin
 
 from track.models import TrackingLog
 

common/djangoapps/util/admin.py

@@ -1,6 +1,6 @@
 """Admin interface for the util app. """
 
-from ratelimitbackend import admin
+from django.contrib import admin
 
 from util.models import RateLimitConfiguration