**Describe the issue**
ClickHouse is unable to start up after upgrading from 20.8 to 21.8. 

There is a replicated table with `:` in zk path and it couldn't be loaded with:

`2021.09.15 03:49:58.435071 [ 633075 ] {} <Error> Application: DB::Exception: Unknown auxiliary ZooKeeper name '/test_prefix'. If it's required it can be added to the section <auxiliary_zookeepers> in config.xml: Cannot attach table `db1`.`table1` from metadata file /var/lib/clickhouse/metadata/db1/table1.sql from query ATTACH TABLE db1.table1 (`field1` String, `date` Date) ENGINE = ReplicatedMergeTree('/test_prefix:db1/{shard}/table1', '{replica}') PARTITION BY toMonth(date) PRIMARY KEY field1 ORDER BY field1 SETTINGS index_granularity = 8192: while loading database `db1` from path /var/lib/clickhouse/metadata/db1
`

**Expected behavior**
ClickHouse server is able to startup after upgrade without schema change. "test_prefix" in "/test_prefix:db1/{shard}/table1" is not interpreted as an auxiliary ZooKeeper name.

ReservationPtr reservation = reserveSpacePreferringTTLRules(metadata_snapshot, 0, move_ttl_infos, time(nullptr), 0, true);
    VolumePtr volume = getStoragePolicy()->getVolume(0);
    auto minmax_idx = std::make_shared<IMergeTreeDataPart::MinMaxIndex>();
    minmax_idx->update(block, getMinMaxColumnsNames(metadata_snapshot->getPartitionKey()));
    auto new_data_part = createPart(
        lost_part_name,
        choosePartType(0, block.rows()),
        new_part_info,
        createVolumeFromReservation(reservation, volume),
        TMP_PREFIX + lost_part_name);
    if (settings->assign_part_uuids)
        new_data_part->uuid = UUIDHelpers::generateV4();
    new_data_part->setColumns(columns);
    new_data_part->rows_count = block.rows();
    {
        auto lock = lockParts();
        auto parts_in_partition = getDataPartsPartitionRange(new_part_info.partition_id);
        if (parts_in_partition.empty())
        {
            LOG_WARNING(log, "Empty part {} is not created instead of lost part because there are no parts in partition {} (it's empty), resolve this manually using DROP PARTITION.", lost_part_name, new_part_info.partition_id);
            return false;
        }
        new_data_part->partition = (*parts_in_partition.begin())->partition;
    }
    new_data_part->minmax_idx = std::move(minmax_idx);
    new_data_part->is_temp = true;
    SyncGuardPtr sync_guard;
    if (new_data_part->isStoredOnDisk())
    {