Imported override_settings from its new location.

tests/admin_custom_urls/tests.py

@@ -3,8 +3,7 @@ from __future__ import unicode_literals
 from django.contrib.admin.utils import quote
 from django.core.urlresolvers import reverse
 from django.template.response import TemplateResponse
-from django.test import TestCase
-from django.test.utils import override_settings
+from django.test import TestCase, override_settings
 
 from .models import Action, Person, Car