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

appengine/swarming/server/task_result_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 631 matching lines @@
         task_result.TaskOutput.CHUNK_SIZE * '\x00' + 'Baz\x00Bar\x00FooWow',
         self.run_result.get_output())
     self.assertTaskOutputChunk(
         [{'chunk': 'Baz\x00Bar\x00FooWow', 'gaps': [3, 4, 7, 8]}])
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   unittest.main()