Update copyright notice from Swarming to LUCI; add AUTHORS and CONTRIBUTORS.

appengine/auth_service/delegation_test.py

 #!/usr/bin/env python
-# Copyright 2015 The Swarming Authors. All rights reserved.
+# Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 import json
 import logging
 import sys
 import time
 import unittest
 
 import test_env
@@ skipping 229 matching lines @@
       delegation.check_can_create_token('user:a@a.com', tok)
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
     logging.basicConfig(level=logging.DEBUG)
   else:
     logging.basicConfig(level=logging.FATAL)
   unittest.main()