Incorporate Ben's changes to ap_listen_open in the beos mpm.  Also used
the opportunity to make the setup_listeners routine the same as the other
mpm's.  If we're all doing it the same should it be in an mpm at all?


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83954 13f79535-47bb-0310-9956-ffa450edef68