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

appengine/config_service/gitiles_import_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 datetime
 import os
 
 from test_env import future
 import test_env
 test_env.setup_test_env()
 
@@ skipping 396 matching lines @@
           ),
       )
     ]
 
     gitiles_import.import_projects()
     self.assertEqual(gitiles_import.import_project.call_count, 2)
 
 
 if __name__ == '__main__':
   test_env.main()