Fixed #8493 -- Fixed a NoReverseMatch when redirecting to password_change/done/ in the admin. Added the ability to override redirects to other password change views for consistency. Thanks for the report mtrichardson.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8473 bcc190cf-cafb-0310-a4f2-bffc1f526a37