Switch example NSD config to splitting master and slave zones into different

subdirectories (/var/nsd/zones/{master,slave}) and create these in mtree.
Nearly everybody that uses NSD for slave zones that I talked to already has
this layout. Bikesh^Wdiscussed with ajacoutot florian millert and others.
ok ajacoutot@ florian@ phessler@ claudio@ jung@

src/etc/mtree/4.4BSD.dist

@@ -1,4 +1,4 @@
-#	$OpenBSD: 4.4BSD.dist,v 1.269 2014/12/22 15:39:28 tedu Exp $
+#	$OpenBSD: 4.4BSD.dist,v 1.270 2015/04/12 11:49:39 sthen Exp $
 
 /set type=dir uname=root gname=wheel mode=0755
 
@@ -738,6 +738,10 @@ var
 
         # ./var/nsd/zones
         zones			uname=root gname=wheel mode=0755
+            master		uname=root gname=wheel mode=0755
+            ..
+            slave		uname=root gname=_nsd mode=0775
+            ..
         ..
     ..
 

src/etc/nsd.conf

@@ -1,4 +1,4 @@
-# $OpenBSD: nsd.conf,v 1.10 2015/03/10 22:16:30 millert Exp $
+# $OpenBSD: nsd.conf,v 1.11 2015/04/12 11:49:39 sthen Exp $
 
 server:
 	hide-version: yes
@@ -22,14 +22,14 @@ remote-control:
 ## master zone example
 #zone:
 #	name: "example.com"
-#	zonefile: "example.com"
+#	zonefile: "master/example.com"
 #	notify: 192.0.2.1 NOKEY
 #	provide-xfr: 192.0.2.1 NOKEY
 
 ## slave zone example
 #zone:
 #	name: "example.net"
-#	zonefile: "example.net"
+#	zonefile: "slave/example.net"
 #	allow-notify: 192.0.2.2 tsig1.example.com.
 #	request-xfr: 192.0.2.2 tsig1.example.com.
 
@@ -38,7 +38,7 @@ remote-control:
 ## %1 - first character of zone name, %2 second, ## %3 third.
 ## %z - topleveldomain label of zone, %y, %x next labels in name.
 #pattern:
-#	name: "primary"
-#	zonefile: "%s.zone"
+#	name: "master"
+#	zonefile: "master/%s.zone"
 #	notify: 192.0.2.1 NOKEY
 #	provide-xfr: 192.0.2.1 NOKEY