Backport r239710, r239711, r239732, r239740 and r241815 to the 2.2.x branch;
Fix PR 28167, which means we stop listening on ports when we do a
graceful-restart.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@290179 13f79535-47bb-0310-9956-ffa450edef68