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

client/tools/run_swarming_tests_on_swarming.py

 #!/usr/bin/env python
-# Copyright 2012 The Swarming Authors. All rights reserved.
-# Use of this source code is governed under the Apache License, Version 2.0 that
-# can be found in the LICENSE file.
+# Copyright 2012 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.
 
 """Runs the whole set of swarming client unit tests on swarming itself.
 
 This is done in a few steps:
   - Archive the whole directory as a single .isolated file.
   - Create one test-specific .isolated for each test to run. The file is created
     directly and archived manually with isolateserver.py.
   - Trigger each of these test-specific .isolated file per OS.
   - Get all results out of order.
 """
@@ skipping 192 matching lines @@
       tests,
       options.logs,
       options.no_idempotent)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   tools.disable_buffering()
   colorama.init()
   sys.exit(main())