Add in bybusyness LB method, via Joel Gluth in

   https://issues.apache.org/bugzilla/show_bug.cgi?id=45501

NOTE: Name changed and added in to ease enhancement/bugfixes


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@686805 13f79535-47bb-0310-9956-ffa450edef68