**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.

DataPartPtr covering_part;
    DataPartsVector src_all_parts;
    {
        
        auto parts_lock = src_data.lockParts();
        src_all_parts = src_data.getActivePartsToReplace(drop_range, drop_range_fake_part_name, covering_part, parts_lock);
    }
    if (covering_part)
        throw Exception(ErrorCodes::LOGICAL_ERROR, "Got part {} covering drop range {}, it's a bug",
                        covering_part->name, drop_range_fake_part_name);
    
    
    
    
    Coordination::Error version_check_code = zookeeper->trySet(alter_partition_version_path, "", alter_partition_version_stat.version);
    if (version_check_code != Coordination::Error::ZOK)
        throw Exception(ErrorCodes::CANNOT_ASSIGN_ALTER, "Cannot DROP PARTITION in {} after copying partition to {}, "
                        "because another ALTER PARTITION query was concurrently executed",
                        getStorageID().getFullTableName(), dest_table_storage->getStorageID().getFullTableName());
    DataPartsVector src_parts;
    MutableDataPartsVector dst_parts;
    Strings block_id_paths;
    Strings part_checksums;
    std::vector<EphemeralLockInZooKeeper> ephemeral_locks;
    LOG_DEBUG(log, "Cloning {} parts", src_all_parts.size());
    static const String TMP_PREFIX = "tmp_move_from_";
    
    String dest_alter_partition_version_path = dest_table_storage->zookeeper_path + "/alter_partition_version";
    Coordination::Stat dest_alter_partition_version_stat;
    zookeeper->get(dest_alter_partition_version_path, &dest_alter_partition_version_stat);