simplify the BalancerMember load factor weighting. Instead of

being percentages (and adjusting when the number don't add
up), loadfactors/lbfactors are now normalized values, so
values like:

   worker    a   b   c
   lbfactor  1   1   2

work as expected (ie: a gets 25%, b gets 25% and c gets 50%).
So we could also have the above as:

   worker    a   b   c
   lbfactor 25  25  50

or even

   worker    a   b   c
   lbfactor 15  15  30



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@122551 13f79535-47bb-0310-9956-ffa450edef68