Fix IBM copyright strings

Update IBM copyright strings to one consistant format

Change-Id: I56bd87dd84a78cc5336d31c3af701941c48e1539
diff --git a/tools/tempest_coverage.py b/tools/tempest_coverage.py
index c385eae..9dcbd46 100755
--- a/tools/tempest_coverage.py
+++ b/tools/tempest_coverage.py
@@ -1,6 +1,6 @@
 # vim: tabstop=4 shiftwidth=4 softtabstop=4
 
-# Copyright 2012 IBM
+# Copyright 2012 IBM Corp.
 #
 #    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