Merge r706318 from trunk:

ap_proxy_determine_connection modifies the url if we are retrying the result we should retry using the orginal url.

Submitted by: jfclere
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@708194 13f79535-47bb-0310-9956-ffa450edef68