Remove compatibility code in runtests.py file

runtests.py

@@ -24,21 +24,14 @@ def runtests():
     if not settings.configured:
         settings.configure(**DEFAULT_SETTINGS)
 
-    # Compatibility with Django 1.7's stricter initialization
-    if hasattr(django, 'setup'):
-        django.setup()
+    django.setup()
 
     parent = os.path.dirname(os.path.abspath(__file__))
     sys.path.insert(0, parent)
 
-    try:
-        from django.test.runner import DiscoverRunner
-        runner_class = DiscoverRunner
-        test_args = ['model_utils.tests']
-    except ImportError:
-        from django.test.simple import DjangoTestSuiteRunner
-        runner_class = DjangoTestSuiteRunner
-        test_args = ['tests']
+    from django.test.runner import DiscoverRunner
+    runner_class = DiscoverRunner
+    test_args = ['model_utils.tests']
 
     failures = runner_class(
         verbosity=1, interactive=True, failfast=False).run_tests(test_args)