[1.3.X] Fixed #16812 -- Percent-encode URLs in verify_exists, to fix test...

[1.3.X] Fixed #16812 -- Percent-encode URLs in verify_exists, to fix test failures on Python 2.5 and 2.6. Backport of r16838 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@17803 bcc190cf-cafb-0310-a4f2-bffc1f526a37