update mqttd program, fix rpi build bug for strcasestr()

Guo Wenxue

2019-06-26 74d93589a9de6c6c5158f122a2f73f6877a6317f

 modules/python/sht20.py

old mode 100644
new mode 100755
@@ -1,4 +1,6 @@
#!/usr/bin/python
#-*- coding: utf-8 -*-

import fcntl
import time
import unittest