After r649840, mod_proxy_http will no longer append a query string from r->args if "no-canon".

Moved the NOESCAPE test down after PATH_INFO, and preserve the query string in r->filename if  
NOESCAPE (which implies "no-canon")

Previously this was only done for CONNECT requests, where (r->uri == r->unparsed_uri)
see mod_proxy:proxy_detect



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@670061 13f79535-47bb-0310-9956-ffa450edef68