Merge r761329 from trunk:

The remote port information was forgotten from the builtin
data of the AJP 13 protocol.  Since the servlet spec allows
to retrieve it via getRemotePort(), we provide the port to
the Tomcat connector as an additional request attribute.
Modern/future Tomcat versions know how to retrieve
the remote port from the attribute AJP_REMOTE_PORT.

See:
https://issues.apache.org/bugzilla/show_bug.cgi?id=41263
http://svn.eu.apache.org/viewvc?view=rev&revision=756926
http://svn.eu.apache.org/viewvc?view=rev&revision=757223

Submitted by: rjung
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@765998 13f79535-47bb-0310-9956-ffa450edef68