prefork: Fix child process hang during graceful restart/stop in

configurations with multiple listening sockets.

PR: 42829
Submitted by: Joe Orton, with some tweaking and testing from me



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@732451 13f79535-47bb-0310-9956-ffa450edef68