Get internal redirects working by initializing the output_filters

list.  We start over with only core_filter just like a fresh request.
Processing of the new URI will determine what filters (if any) are
appropriate.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86256 13f79535-47bb-0310-9956-ffa450edef68