Fixed AT&T Copyright statements

Change-Id: Ic3a78bb5393e2fb11ea8382c6cfa6258d1ce4ad6
diff --git a/tests/test_rbac_utils.py b/tests/test_rbac_utils.py
index 657b389..3c645f8 100644
--- a/tests/test_rbac_utils.py
+++ b/tests/test_rbac_utils.py
@@ -1,4 +1,5 @@
-#    Copyright 2017 AT&T Inc.
+# Copyright 2017 AT&T Corporation.
+# All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may
 #    not use this file except in compliance with the License. You may obtain