Fixed a few more imports of django.utils.unittest.

One import per line please! Refs #20680.

django/contrib/gis/tests/geoapp/tests.py

@@ -1,6 +1,7 @@
 from __future__ import absolute_import
 
 import re
+import unittest
 from unittest import skipUnless
 
 from django.db import connection
@@ -10,7 +11,7 @@ from django.contrib.gis.tests.utils import (
     no_mysql, no_oracle, no_spatialite,
     mysql, oracle, postgis, spatialite)
 from django.test import TestCase
-from django.utils import six, unittest
+from django.utils import six
 
 if HAS_GEOS:
     from django.contrib.gis.geos import (fromstr, GEOSGeometry,