Add dynamic management to load balancer:

<Location /manager>
  SetHandler balancer-manager
</Location>
It enables changing load factors, session routes, redirection
routes, and disabling/enabling particular workers.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104812 13f79535-47bb-0310-9956-ffa450edef68