Merge r686805, r687099 from trunk:

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


Add in additional logging and use correct formats

Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@696752 13f79535-47bb-0310-9956-ffa450edef68