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

appengine/swarming/server/task_request_test.py

 #!/usr/bin/env python
-# Copyright 2014 The Swarming Authors. All rights reserved.
+# Copyright 2014 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 datetime
 import logging
 import os
 import random
 import sys
 import unittest
 
@@ skipping 498 matching lines @@
         ndb.Key(task_request.TaskRequest, 0x7f14acec2fcfffff),
         task_request.request_id_to_key(0xeb5313d0300000))
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.ERROR)
   unittest.main()