Merge r443503 from trunk:

* PROXY_WORKER_IS_INITIALIZED checks if PROXY_WORKER_INITIALIZED is set in
  worker->s->status, but we need to check here if it is set in worker->status.

  As PROXY_WORKER_INITIALIZED is set in worker->s->status in
  ap_proxy_initialize_worker_share, which is called just before
  ap_proxy_initialize_worker we never initialize the worker. This is very bad
  as we create no reslist for the pool in this case.

Reviewed by: jim, rpluem, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@452465 13f79535-47bb-0310-9956-ffa450edef68