mark max-zone-ttl deprecated in options and zone

The "max-zone-ttl" option should now be configured as part of
"dnssec-policy". The option with the same name in "zone" and
"options" is hereby flagged as deprecated, and its functionality
will be removed in a future release.

bin/tests/system/checkconf/deprecated.conf

@@ -13,6 +13,7 @@
 
 options {
 	dnssec-validation yes;
+	max-zone-ttl 600;
 };
 
 trusted-keys {
@@ -36,3 +37,9 @@ managed-keys {
 		RUfhHdY6+cn8HFRm+2hM8AnXGXws9555KrUB5qihylGa8subX2Nn6UwN
 		R1AkUTV74bU=";
 };
+
+zone example.com {
+        type primary;
+	file "maxttl-bad.db";
+	max-zone-ttl 120;
+};