mod_proxy_ajp: Support unknown HTTP methods.

BZ 54416

Forward unknown methods as request attributes
using method id SC_M_JK_STORED=0xFF and
request attribute id SC_A_STORED_METHOD=13.

Code ported from mod_jk (which got it from mod_jk2).

Supported by Tomcat at least since TC 4.1.
Doesn't seem to be supported by Jetty though.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1435178 13f79535-47bb-0310-9956-ffa450edef68