Changes to configuration to guess the userid and groupid apache

runs as. And to chown/chgrp the proxycachedir during an install.

PR:
Obtained from:
Submitted by: dirkx
Reviewed by: rse


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83025 13f79535-47bb-0310-9956-ffa450edef68