Merge r1383490 from trunk:

Avoid the overhead of creating and grabbing a uuid for
the balancer nonce if we're never going to use it.
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1388549 13f79535-47bb-0310-9956-ffa450edef68