Add licence and boilerplate to Online module_utils

lib/ansible/module_utils/online.py

@@ -1,3 +1,8 @@
+# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
 import json
 import sys