Removes a lengthy and unnecessary discussion of the various methods of

load balancing. Removes a RewriteMap prg load balancing script, and
replaces it with a RewriteMap rnd example of the same, as well as an
admonition to use mod_proxy_balancer instead.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@835364 13f79535-47bb-0310-9956-ffa450edef68