add tsg_sn_update.py, tsg_monit_device.py

py_test/parse_json.py

@@ -0,0 +1,21 @@
+import json
+
+SN_JSON_PATH = '/opt/tsg/etc/tsg_sn.json'
+
+def tsg_get_sn():
+    try:
+        with open(SN_JSON_PATH) as json_fp:
+            json_dict = json.load(json_fp)
+            return json_dict['sn']
+    except IOError:
+        return ""
+        
+def main():
+    sn = tsg_get_sn()
+    if len(sn) > 0:
+        print("%s" %(sn))
+    else:
+        print("can't get sn")
+        
+if __name__ == '__main__':
+    main()