Fixed #21774 -- Isolate all test urls from eachother.

This (nearly) completes the work to isolate all the test modules from
each other. This is now more important as importing models from another
module will case PendingDeprecationWarnings if those modules are not in
INSTALLED_APPS. The only remaining obvious dependencies are:

- d.c.auth depends on d.c.admin (because of the is_admin flag to some
  views), but this is not so important and d.c.admin is in
  always_installed_apps
- test_client_regress depends on test_client. Eventually these should
  become a single module, as the split serves no useful purpose.

tests/resolve_url/tests.py

@@ -1,10 +1,9 @@
 from __future__ import unicode_literals
 
-from unittest import TestCase
-
 from django.core.urlresolvers import NoReverseMatch
 from django.contrib.auth.views import logout
 from django.shortcuts import resolve_url
+from django.test import TestCase
 
 from .models import UnimportantThing
 
@@ -13,6 +12,7 @@ class ResolveUrlTests(TestCase):
     """
     Tests for the ``resolve_url`` function.
     """
+    urls = 'resolve_url.urls'
 
     def test_url_path(self):
         """