merge r814045 from trunk (2.2.x rev 814847):

CVE-2009-3095: mod_proxy_ftp sanity check authn credentials.
Submitted by: Stefan Fritsch <sf fritsch.de>, Joe Orton

Reviewed by: pgollucci, poirier, rjung, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@943980 13f79535-47bb-0310-9956-ffa450edef68