mod_status: don't include workers from dead or quiescing processes in the

"requests currently being processed" or "idle" counts

also, change term from "servers" to "workers" - servers sounds like what
you call the whole thing


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89820 13f79535-47bb-0310-9956-ffa450edef68