Fixed #15617 - CSRF referer checking too strict

Thanks to adam for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15840 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/utils/tests.py

@@ -7,6 +7,7 @@ from feedgenerator import *
 from module_loading import *
 from termcolors import *
 from html import *
+from http import *
 from checksums import *
 from text import *
 from simplelazyobject import *