add domain-name to dhcp config

Author: TimoDJatomika

example-dhcp.txt

@@ -2,4 +2,5 @@ set service dhcp-server shared-network-name CLIENT-LAN authoritative disable
 set service dhcp-server shared-network-name CLIENT-LAN subnet 172.22.1.0/24 default-router 172.22.1.1
 set service dhcp-server shared-network-name CLIENT-LAN subnet 172.22.1.0/24 dns-server 172.21.7.147
 set service dhcp-server shared-network-name CLIENT-LAN subnet 172.22.1.0/24 lease 86400
+set service dhcp-server shared-network-name CLIENT-LAN subnet 172.22.1.0/24 domain-name example.com
 set service dhcp-server shared-network-name CLIENT-LAN subnet 172.22.1.0/24 start 172.22.1.10 stop 172.22.1.100