Restore the ability to specify host names on Listen directives.

We needed to compare on the value we pass to apr_sockaddr_info_get(),
not the IP address string.  Sometimes this is an IP address string
and sometimes it is a host name.  Otherwise, on the second pass
through this code we won't find the existing listen_rec for a Listen
directive which had a host name, and we'll create a new listen_rec
and try to bind again to the same addr/port.

PR:                  11030
Helped immensely by: David Shane Holden <dpejesh@yahoo.com>,
                     who debugged it and submitted a patch which
                     showed the problem; a much simpler change was
                     committed though


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96258 13f79535-47bb-0310-9956-ffa450edef68