Fixed #5595 -- Made `ModPythonRequest.__repr__` return a string instead of a unicode object. Fixes the printout of the request object in those server error e-mails I never get :)

      git-svn-id: http://code.djangoproject.com/svn/django/trunk@7200 bcc190cf-cafb-0310-a4f2-bffc1f526a37