Set ypserv_flags to NO by default.

ok robert@

src/etc/rc.conf

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: rc.conf,v 1.147 2011/07/07 22:30:37 robert Exp $
+#	$OpenBSD: rc.conf,v 1.148 2011/07/07 23:31:09 ajacoutot Exp $
 
 # set these to "NO" to turn them off.  otherwise, they're used as flags
 ldpd_flags=NO		# for normal use: ""
@@ -96,7 +96,7 @@ multicast_router=NO	# A multicast routing daemon will be run, e.g. mrouted
 # miscellaneous other flags
 # only used if the appropriate server is marked YES above
 savecore_flags=			# "-z" to compress
-ypserv_flags=			# E.g. -1 for YP v1, -d for DNS etc
+ypserv_flags=NO			# add more flags, eg. -1 for YP v1, -d for DNS etc
 yppasswdd_flags=NO		# "-d /etc/yp" if passwd files are in /etc/yp
 nfsd_flags="-tun 4"		# Crank the 4 for a busy NFS fileserver
 amd_master=/etc/amd/master	# AMD 'master' map