Comment 0 for bug 1557979

Reported downstream: https://bugzilla.redhat.com/show_bug.cgi?id=1317695

Our DHCP server is always enabled. Actually it's not needed if no nodes are on introspection and no node_not_found_hook is set. By disabling it in firewall we'll avoid problems like in bug above, when deployed nodes get DHCP via our server.