nft-qos: add new package

This is the nftables implementation for qos on OpenWrt,
Currently, it has below features:

* Static QoS : setting limit rate for devices or global network.

* Dynamic/Auto QoS : setting limit rate according to the network
  bandwidth and adjust itself automatically (hotplug event).

* Traffic Priority : this feature is like traffic shaping under tc,
  it uses ingress hook to handle to packets here.

Signed-off-by: Rosy Song <rosysong@rosinson.com>

net/nft-qos/files/nft-qos-monitor.hotplug

@@ -0,0 +1,13 @@
+#!/bin/sh
+#
+# Copyright 2018 rosysong@rosinson.com
+#
+
+. /lib/nft-qos/monitor.sh
+
+logger -t nft-qos-monitor "ACTION=$ACTION, MACADDR=$MACADDR, IPADDR=$IPADDR, HOSTNAME=$HOSTNAME"
+
+case "$ACTION" in
+	add | update) qosdef_init_env && qosdef_monitor_add $MACADDR $IPADDR $HOSTNAME;;
+	remove) qosdef_init_env && qosdef_monitor_del $MACADDR $IPADDR $HOSTNAME;;
+esac