Get host information about slave

    .. versionadded: 2016.3.0

    CLI Example:

    .. code-block:: bash

        salt '*' redis.get_master_ip

def get_master_ip(host=None, port=None, password=None):
    '''
    Get host information about slave

    .. versionadded: 2016.3.0

    CLI Example:

    .. code-block:: bash

        salt '*' redis.get_master_ip
    '''
    server = _connect(host, port, password)
    srv_info = server.info()
    ret = (srv_info.get('master_host', ''), srv_info.get('master_port', ''))
    return dict(list(zip(('master_host', 'master_port'), ret)))