Fixed #27018 -- Fixed admindocs crash with a view in a class.

Generated correct admindocs URLs on Python 3. URLs generate 404s on
Python 2, as in older versions of Django.

tests/urlpatterns_reverse/method_view_urls.py

@@ -0,0 +1,18 @@
+from django.conf.urls import url
+
+
+class ViewContainer(object):
+    def method_view(self, request):
+        pass
+
+    @classmethod
+    def classmethod_view(cls, request):
+        pass
+
+view_container = ViewContainer()
+
+
+urlpatterns = [
+    url(r'^$', view_container.method_view, name='instance-method-url'),
+    url(r'^$', ViewContainer.classmethod_view, name='instance-method-url'),
+]