<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def __init_configrs(self, rs_cfg):
 """Create and start a config replica set."""

        # Use 'rs_id' to set the id for consistency, but need to rename
        # to 'id' to use with ReplicaSets.create()
        rs_cfg['id'] = rs_cfg.pop('rs_id', None)
        for member in rs_cfg.setdefault('members', [{}]):
            member['procParams'] = self._strip_auth(
                member.get('procParams', {}))
            member['procParams']['configsvr'] = True
            if self.enable_ipv6:
                common.enable_ipv6_single(member['procParams'])
        rs_cfg['sslParams'] = self.sslParams
        self._configsvrs.append(ReplicaSets().create(rs_cfg))