Update imports to drop Django 1.8 support

Author: Martin Pauly

test_haystack/solr_tests/test_admin.py

@@ -7,10 +7,7 @@
 from django.contrib.auth.models import User
 from django.test import TestCase
 from django.test.utils import override_settings
-if django.VERSION < (1, 10):
-    from django.core.urlresolvers import reverse
-else:
-    from django.urls import reverse
+from django.urls import reverse
 
 from haystack import connections, reset_search_queries
 from haystack.utils.loading import UnifiedIndex

test_haystack/test_app_loading.py

@@ -4,10 +4,7 @@
 from types import GeneratorType, ModuleType
 
 import django
-if django.VERSION < (1, 10):
-    from django.core.urlresolvers import reverse
-else:
-    from django.urls import reverse
+from django.urls import reverse
 from django.test import TestCase
 
 from haystack.utils import app_loading

test_haystack/test_views.py

@@ -10,10 +10,7 @@
 from django.http import HttpRequest, QueryDict
 from django.test import TestCase, override_settings
 from django.utils.six.moves import queue
-if django.VERSION < (1, 10):
-    from django.core.urlresolvers import reverse
-else:
-    from django.urls import reverse
+from django.urls import reverse
 from test_haystack.core.models import AnotherMockModel, MockModel
 
 from haystack import connections, indexes