Enhance CacheEnable/CacheDisable to control caching on a per-protocol, per-host
and per-path basis. Makes Cache(En|Dis)able useful for forward proxy servers.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@239421 13f79535-47bb-0310-9956-ffa450edef68