Fixed AT&T Copyright statements

Change-Id: Ic3a78bb5393e2fb11ea8382c6cfa6258d1ce4ad6
diff --git a/patrole_tempest_plugin/rbac_auth.py b/patrole_tempest_plugin/rbac_auth.py
index 78cc951..1afc7ae 100644
--- a/patrole_tempest_plugin/rbac_auth.py
+++ b/patrole_tempest_plugin/rbac_auth.py
@@ -1,4 +1,4 @@
-# Copyright 2017 AT&T Corp
+# Copyright 2017 AT&T Corporation.
 # All Rights Reserved.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License"); you may