mod_remoteip: Set useragent port to zero PR59931

When overriding the useragent address from X-Forwarded-For,
zero out what had been initialized as the connection-level port.  

Submitted By: Hank Ibell <hwibell gmail.com>
Reviewed by: ylavic, covener, icing


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1833007 13f79535-47bb-0310-9956-ffa450edef68