Return truth of whether iptables has `option`.  For example:

    .. code-block:: python

        _has_option('--wait')
        _has_option('--check', family='ipv6')

def _has_option(option, family='ipv4'):
    '''
    Return truth of whether iptables has `option`.  For example:

    .. code-block:: python

        _has_option('--wait')
        _has_option('--check', family='ipv6')
    '''
    cmd = '{0} --help'.format(_iptables_cmd(family))
    if option in __salt__['cmd.run'](cmd, output_loglevel='quiet'):
        return True
    return False