Restarts were hosed after the APR changes because we were opening

sockets even when we had them open already. So, for now, add an "active"
flag that indicates whether the socket stored in the listen_rec is an
actual open socket yet.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83918 13f79535-47bb-0310-9956-ffa450edef68