**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.

PartDescriptions final_parts;
    Strings final_part_names;
    {
        final_part_names = adding_parts_active_set.getParts();
        for (const String & final_part_name : final_part_names)
        {
            auto part_desc = part_name_to_desc[final_part_name];
            if (!part_desc)
                throw Exception("There is no final part " + final_part_name + ". This is a bug", ErrorCodes::LOGICAL_ERROR);
            final_parts.emplace_back(part_desc);
            if (final_parts.size() > 1)
            {
                auto & prev = *final_parts[final_parts.size() - 2];
                auto & curr = *final_parts[final_parts.size() - 1];
                if (!prev.found_new_part_info.isDisjoint(curr.found_new_part_info))
                {
                    throw Exception("Intersected final parts detected: " + prev.found_new_part_name
                        + " and " + curr.found_new_part_name + ". It should be investigated.", ErrorCodes::LOGICAL_ERROR);
                }
            }
        }
    }
    static const String TMP_PREFIX = "tmp_replace_from_";
    auto obtain_part = [&] (PartDescriptionPtr & part_desc)
    {
        if (part_desc->src_table_part)
        {
            if (part_desc->checksum_hex != part_desc->src_table_part->checksums.getTotalChecksumHex())
                throw Exception("Checksums of " + part_desc->src_table_part->name + " is suddenly changed", ErrorCodes::UNFINISHED);
            part_desc->res_part = cloneAndLoadDataPartOnSameDisk(