Fixed #26013 -- Moved django.core.urlresolvers to django.urls.

Thanks to Tim Graham for the review.

tests/urlpatterns_reverse/views.py

@@ -1,8 +1,8 @@
 from functools import partial, update_wrapper
 
 from django.contrib.auth.decorators import user_passes_test
-from django.core.urlresolvers import reverse_lazy
 from django.http import HttpResponse
+from django.urls import reverse_lazy
 from django.views.generic import RedirectView