Remove slaves that are in an ODOWN or SDOWN state

def filter_slaves(self, slaves):
        "Remove slaves that are in an ODOWN or SDOWN state"
        slaves_alive = []
        for slave in slaves:
            if slave['is_odown'] or slave['is_sdown']:
                continue
            slaves_alive.append((slave['ip'], slave['port']))
        return slaves_alive