**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.

part_desc->src_table_part, TMP_PREFIX + "clone_", part_desc->new_part_info, metadata_snapshot);
        }
        else if (!part_desc->replica.empty())
        {
            String source_replica_path = fs::path(zookeeper_path) / "replicas" / part_desc->replica;
            ReplicatedMergeTreeAddress address(getZooKeeper()->get(fs::path(source_replica_path) / "host"));
            auto timeouts = getFetchPartHTTPTimeouts(getContext());
            auto credentials = getContext()->getInterserverCredentials();
            String interserver_scheme = getContext()->getInterserverScheme();
            if (interserver_scheme != address.scheme)
                throw Exception("Interserver schemas are different '" + interserver_scheme + "' != '" + address.scheme + "', can't fetch part from " + address.host, ErrorCodes::LOGICAL_ERROR);
            part_desc->res_part = fetcher.fetchPart(
                metadata_snapshot, getContext(), part_desc->found_new_part_name, source_replica_path,
                address.host, address.replication_port, timeouts, credentials->getUser(), credentials->getPassword(),
                interserver_scheme, replicated_fetches_throttler, false, TMP_PREFIX + "fetch_");
            
            ProfileEvents::increment(ProfileEvents::ReplicatedPartFetches);
        }
        else
            throw Exception("There is no receipt to produce part " + part_desc->new_part_name + ". This is bug", ErrorCodes::LOGICAL_ERROR);
    };
    
    
    for (PartDescriptionPtr & part_desc : final_parts)
        obtain_part(part_desc);
    MutableDataPartsVector res_parts;
    for (PartDescriptionPtr & part_desc : final_parts)
        res_parts.emplace_back(part_desc->res_part);
    try
    {