Try to have something that has the right size.

The remaining problem is that proxy_lb_workers() only gives a good value when
the config file has been parsed (can't be used in preconfig().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/httpd-proxy-scoreboard@425759 13f79535-47bb-0310-9956-ffa450edef68