[1.1.X] Fixed #5034 -- honor request.urlconf in reverse and resolve.

This enables {% url %} to honor request.urlconf set from process_request
middleware methods.

Thanks SmileyChris for the initial patch work.

Backport of [11740] from trunk

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@11741 bcc190cf-cafb-0310-a4f2-bffc1f526a37