Do not allow stopping/restarting mountd using the rc.d(8) framework;

if there is need to send a SIGTERM to mountd(8), it should be done
manually as there is too much involved with RPC daemons to make it
automagic.
ok beck@

src/etc/rc.d/mountd

@@ -1,11 +1,13 @@
 #!/bin/sh
 #
-# $OpenBSD: mountd,v 1.3 2012/08/14 07:43:57 ajacoutot Exp $
+# $OpenBSD: mountd,v 1.4 2013/01/26 08:00:11 ajacoutot Exp $
 
 daemon="/sbin/mountd"
 
 . /etc/rc.d/rc.subr
 
+rc_stop=NO
+
 rc_pre() {
 	[ -s /etc/exports ] && grep -qv '^#' /etc/exports && \
 		rm -f /var/db/mountdtab && \