Add support for the netid.byname YP map. This map is used by getgrouplist(3),

which is used by (amongst other things) initgroups(3) to set the supplemantary
groups on login.
OK pyr@

src/etc/ypldap.conf

@@ -1,4 +1,4 @@
-# $OpenBSD: ypldap.conf,v 1.1 2011/07/07 02:22:11 ajacoutot Exp $
+# $OpenBSD: ypldap.conf,v 1.2 2011/08/28 11:53:16 aschrijver Exp $
 
 domain		"example.com"
 interval	60
@@ -6,6 +6,7 @@ provide map	"passwd.byname"
 provide map	"passwd.byuid"
 provide map	"group.byname"
 provide map	"group.bygid"
+provide map	"netid.byname"
 
 directory "127.0.0.1" {
 	# directory options