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

appengine/machine_provider/handlers_endpoints_test.py

 #!/usr/bin/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.
 
 """Unit tests for handlers_endpoints.py."""
 
 import json
 import unittest
 
 import test_env
 test_env.setup_test_env()
@@ skipping 481 matching lines @@
         rpc_messages.LeaseResponse,
     )
     self.assertEqual(
         lease_response.error,
         rpc_messages.LeaseRequestError.UNSPECIFIED_TOPIC,
     )
 
 
 if __name__ == '__main__':
   unittest.main()