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

client/tests/run_isolated_test.py

 #!/usr/bin/env python
-# Copyright 2013 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 2013 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.
 
 # pylint: disable=R0201
 
 import StringIO
 import functools
 import json
 import logging
 import os
 import sys
 import tempfile
@@ skipping 474 matching lines @@
       u'version': 2,
     }
     self.assertEqual(expected, tools.read_json(out))
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.ERROR)
   unittest.main()