mod_proxy_balancer: Force workers into PROXY_WORKER_IN_ERROR when configured

statuses are found

PR: 48939
Backports: 930125, 930254, 962972, 987359
Submitted by: Daniel Ruggeri <DRuggeri primary.net>
Reviewed by: trawick, niq, wrowe



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1005571 13f79535-47bb-0310-9956-ffa450edef68