qemu: virtio-console-helper as a separate package

While at it, update copyright header.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

utils/qemu/files/00-virtio-ports.hotplug

@@ -0,0 +1,19 @@
+#!/bin/sh
+# Copyright (C) 2016 OpenWrt.org
+# Copyright (C) 2016 Yousong Zhou <yszhou4tech@gmail.com>
+
+[ "$SUBSYSTEM" = "virtio-ports" ] || exit 0
+
+syspath="/sys/$DEVPATH"
+name="$(cat "$syspath/name" 2>/dev/null)"
+[ -n "$name" ] || exit 0
+
+case "$ACTION" in
+	"add")
+		mkdir -p /dev/virtio-ports
+		ln -s "/dev/$DEVNAME" "/dev/virtio-ports/$name"
+		;;
+	"del")
+		rm -f "/dev/virtio-ports/$name"
+		;;
+esac