Redirect Recipe log messages to a file.

def create_recipe_file_logger(logger, logfile, logformat):
    """Redirect Recipe log messages to a file."""
    recipe_formatter = logging.Formatter(logformat)
    fh = logging.FileHandler(logfile, mode='w')
    fh.setLevel(logging.DEBUG)
    fh.setFormatter(recipe_formatter)
    return fh