Restore the ability to specify host names on Listen directives.

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