open-vm-tools: Add new package open-vm-tools

Add new package,
open-vm-tools is Open Virtual Machine Tools for VMware guest OS

tested: OpenWrt master and 18.06.2 (x86_64) on ESXi 6.5, 6.7

Signed-off-by: Yuhei OKAWA <tochiro.srchack@gmail.com>

utils/open-vm-tools/files/shutdown

@@ -0,0 +1,8 @@
+#!/bin/sh
+#compatibility script for openvmtools
+
+if [ "$1" == "-r" ]; then
+  /sbin/reboot
+else
+  /sbin/poweroff
+fi