'Find the common lun id in mcs channel.'

def _get_mcs_channel_lun_map(self, channel_list):

    map_lun = []
    for lun_id in range(self.constants['MAX_LUN_MAP_PER_CHL']):
        check_map = True
        for channel_id in channel_list:
            if (lun_id not in self.map_dict['slot_a'][channel_id]):
                check_map = False
        if check_map:
            map_lun.append(str(lun_id))
            break
    return map_lun
