Added `cros_pin` CrOS pin-bump tool.

infra/tools/cros_pin/__main__.py

 #!/usr/bin/python
 # Copyright 2014 Google Inc. All Rights Reserved.
 # pylint: disable=F0401
 
-"""Restart a master via master-manager."""
+"""CrOS pin management/update tool."""
 
 
 import argparse
 import datetime
 import sys
 
-
 import infra_libs.logs
 
-
-from infra.tools.restart import restart
+from infra.tools.cros_pin import cros_pin
 
 
 def main(argv):
   parser = argparse.ArgumentParser(
-      prog='restart',
+      prog='cros-pin',
       description=sys.modules['__main__'].__doc__)
   infra_libs.logs.add_argparse_options(parser)
-  restart.add_argparse_options(parser)
+  cros_pin.add_argparse_options(parser)
+
   args = parser.parse_args(argv)
   infra_libs.logs.process_argparse_options(args)
 
-  if args.minutes_in_future < 0:
-    parser.error('minutes-in-future must be nonnegative, use 0 for "now"')
-
-  delta = datetime.timedelta(minutes=args.minutes_in_future)
-
-  return restart.run(args.masters, delta, args.reviewer, args.bug, args.force,
-                     args.no_commit)
+  # Execute our subcommand (configured by cros_pin.add_argparse_options).
+  return args.func(args)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))