Adding AUTHORS and changing copyright headers to refer to it.

Change-Id: Id3306370911baf01bd2137dc0fbc8c421682e9f7
diff --git a/test/hftest/hftest.py b/test/hftest/hftest.py
index 40aeaca..bc17b70 100755
--- a/test/hftest/hftest.py
+++ b/test/hftest/hftest.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2018 Google LLC
+# Copyright 2018 The Hafnium Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.