Backport r814079:

Add an RPM init.d script to start the htcacheclean daemon, controlled
by the optional /etc/sysconfig/htcacheclean configuration.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@814081 13f79535-47bb-0310-9956-ffa450edef68