leaving the pipe-of-death in the ap_listeners list led to segfaults

leaving the pipe-of-death in the ap_listeners list led to segfaults
during sighup processing since the pipe-of-death listen_rec was
allocated from a short-lived pool

simply allocating the pipe-of-death listen_rec from the right pool
isn't a complete fix since at that point we no longer get the
proper cleanup and we're left with a file descriptor leak

the simplest overall fix seems to be to keep the pipe-of-death out
of the ap_listeners list for now

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92521 13f79535-47bb-0310-9956-ffa450edef68