Always allow avahi

src/freedombone

   if grep -Fxq "configure_firewall_for_avahi" $COMPLETION_FILE; then
       return
   fi
-  if [[ $ENABLE_CJDNS != "yes" && $ENABLE_BATMAN != "yes" && $ENABLE_BABEL != "yes" ]]; then
-      return
-  fi
   iptables -A INPUT -p tcp --dport 548 -j ACCEPT
   iptables -A INPUT -p udp --dport 548 -j ACCEPT
   iptables -A INPUT -p tcp --dport 5353 -j ACCEPT