pyrocufflink-dhcp: Add options to mgmt network

Specifying the DNS domain and UniFi address on the Management network
helps Ubiquiti devices more quickly locate the UniFi controller.

group_vars/pyrocufflink-dhcp.yml

@@ -20,8 +20,11 @@ dhcp_subnets:
     end: 172.30.0.253
   routers:
   - 172.30.0.241
+  domain_name: pyrocufflink.blue
+  ddns_updates: false
   dns_servers: '{{ dch_networks.mgmt.dns_servers_v4 }}'
   ntp_servers: '{{ dch_networks.mgmt.ntp_servers }}'
+  unifi_address: ubnt.pyrocufflink.blue
 
 # pyrocufflink.blue
 - address: 172.30.0.0/26