[sudo-sys] Changes to network

I changed the 192.168.42.1 gateway like so: * Changed hostname to space * Changed domain to local * Installed avahi-daemon * Disabled dnsmasq's dhcp function * Installed and configured isc-dhcp-server (dnsmasq's dhcp is not for large networks) * Changed DNS servers from google's to sonic.net's * Expanded the subnet to /16 * Changed/expanded dhcp range to 192.168.50.1-192.168.200.254 * Lowered dhcp lease time to 600 second (1200 max) I removed a rogue dhcp server that was running on the network (we really need a script to detect these).