Sprinkle with grains of salt, that is
    convert 'test {id} test {host} ' types of strings
    :param config_str: The string to be sprinkled
    :return: The string sprinkled

def _sprinkle(config_str):
    '''
    Sprinkle with grains of salt, that is
    convert 'test {id} test {host} ' types of strings
    :param config_str: The string to be sprinkled
    :return: The string sprinkled
    '''
    parts = [x for sub in config_str.split('{') for x in sub.split('}')]
    for i in range(1, len(parts), 2):
        parts[i] = six.text_type(__grains__.get(parts[i], ''))
    return ''.join(parts)