Add a named acl example

bin/tests/system/nsupdate/ns1/named.conf.in

@@ -23,6 +23,10 @@ options {
 	minimal-responses no;
 };
 
+acl named-acl {
+	any;
+};
+
 key rndc_key {
 	secret "1234abcd8765";
 	algorithm hmac-sha256;
@@ -67,7 +71,7 @@ zone "max-ttl.nil" {
 	file "max-ttl.db";
 	max-zone-ttl 300;
 	check-integrity no;
-	allow-update { any; };
+	allow-update { named-acl; };
 	allow-transfer { any; };
 };