deprecate "dialup" and "heartbeat-interval"

these options concentrate zone maintenance actions into
bursts for the benefit of servers with intermittent connections.
that's no longer something we really need to optimize.

bin/tests/system/checkconf/deprecated.conf

@@ -19,6 +19,9 @@ options {
 	dnssec-validation yes;
 	max-zone-ttl 600;
 
+        dialup yes;
+        heartbeat-interval 60;
+
 	use-v4-udp-ports { range 1024 65535; };
 	use-v6-udp-ports { range 1024 65535; };
 	avoid-v4-udp-ports { range 1 1023; };