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

appengine/components/test_support/test_env.py

-# Copyright 2013 The Swarming Authors. All rights reserved.
+# 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.
 
 import os
 import sys
 
 # /appengine/
 ROOT_DIR = os.path.dirname(
     os.path.dirname(os.path.realpath(os.path.abspath(__file__))))
 
 _INITIALIZED = False
 
 
 def setup_test_env():
   """Sets up App Engine/Django test environment."""
   global _INITIALIZED
   if _INITIALIZED:
     raise Exception('Do not call test_env.setup_test_env() twice.')
   _INITIALIZED = True
 
   # For 'from components import ...' and 'from test_support import ...'.
   sys.path.insert(0, ROOT_DIR)
   sys.path.insert(0, os.path.join(ROOT_DIR, '..', 'third_party_local'))
 
   from tool_support import gae_sdk_utils
   gae_sdk_utils.setup_gae_env()
   gae_sdk_utils.setup_env(None, 'sample-app', 'v1a', None)