Add in option to always disable gsutil version check

gsutil.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Run a pinned gsutil."""
 
 
 import argparse
 import base64
@@ skipping 107 matching lines @@
   if not check_gsutil(gsutil_bin):
     raise InvalidGsutilError()
   return gsutil_bin
 
 
 def run_gsutil(force_version, fallback, target, args, clean=False):
   if force_version:
     gsutil_bin = ensure_gsutil(force_version, target, clean)
   else:
     gsutil_bin = fallback
-  cmd = [sys.executable, gsutil_bin] + args
+  disable_update = ['-o', 'GSUtil:software_update_check_period=0']
+  cmd = [sys.executable, gsutil_bin] + disable_update + args
   return subprocess.call(cmd)
 
 
 def parse_args():
   bin_dir = os.environ.get('DEPOT_TOOLS_GSUTIL_BIN_DIR', DEFAULT_BIN_DIR)
 
   parser = argparse.ArgumentParser()
   parser.add_argument('--force-version', default='4.13')
   parser.add_argument('--clean', action='store_true',
       help='Clear any existing gsutil package, forcing a new download.')
@@ skipping 11 matching lines @@
   return args
 
 
 def main():
   args = parse_args()
   return run_gsutil(args.force_version, args.fallback, args.target, args.args,
                     clean=args.clean)
 
 if __name__ == '__main__':
   sys.exit(main())