Fix a bug pointed out by Lars on new-httpd in message-id

<XFMail.971109183845.sfx@unix-ag.org>.  I'm not sure how this ever worked
before.  Luck I guess.

If a request matches the vhost of a proxy then it's quite possible that
various other modules such as mod_alias will get their grubby hands on
the uri and play games like Alias or ScriptAlias and then short-circuit
the translate_names phase before mod_proxy gets to handle
"ProxyRequests on".  So instead mod_proxy handles "ProxyRequests on"
in the post_read_request phase... which can't be short-circuited.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80423 13f79535-47bb-0310-9956-ffa450edef68