Fixed #15552 -- LOGIN_URL and LOGIN_REDIRECT_URL can take URLpattern names.

Thanks UloPe and Eric Florenzano for the patch, and Malcolm Tredinnick for
review.

tests/regressiontests/resolve_url/models.py

@@ -0,0 +1,12 @@
+"""
+Regression tests for the resolve_url function.
+"""
+
+from django.db import models
+
+
+class UnimportantThing(models.Model):
+    importance = models.IntegerField()
+
+    def get_absolute_url(self):
+        return '/importance/%d/' % (self.importance,)