Feature Request - CAX80 Configure the LAN DNS Servers provided by DHCP

User Story:

As a CAX80 user, I host a local DNS server on my network that allows me to manage outbound access from my machines and mitigate malware. 

I want to control the DNS servers provided to my devices from my CAX80 using DHCP.  This includes both IPv4 and IPv6 DNS servers.

Please implement the use of custom DNS servers and domain suffix to be configured under the LAN configuration tab.