Change the order of mod_proxy and mod_proxy_balancer child_init().

Change the balancer workers area to the address of workers instead copying the workers.
Arrange lbmethod accordingly.
Move the creation of conf->forward worker to mod_proxy child_init().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@771940 13f79535-47bb-0310-9956-ffa450edef68