**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.

}
        }
    }
    
    cloneMetadataIfNeeded(source_replica, source_path, zookeeper);
    
    Strings source_replica_parts = zookeeper->getChildren(fs::path(source_path) / "parts");
    for (const auto & active_part : source_replica_parts)
        get_part_set.add(active_part);
    Strings active_parts = get_part_set.getParts();
    
    Strings local_parts_in_zk = zookeeper->getChildren(fs::path(replica_path) / "parts");
    Strings parts_to_remove_from_zk;
    for (const auto & part : local_parts_in_zk)
    {
        if (get_part_set.getContainingPart(part).empty())
        {
            parts_to_remove_from_zk.emplace_back(part);
            LOG_WARNING(log, "Source replica does not have part {}. Removing it from ZooKeeper.", part);
        }
    }
    {
        
        
        
        Coordination::Stat is_lost_stat_new;
        zookeeper->get(fs::path(source_path) / "is_lost", &is_lost_stat_new);
        if (is_lost_stat_new.version != source_is_lost_stat.version)
            throw Exception(ErrorCodes::REPLICA_STATUS_CHANGED, "Cannot clone {}, because it suddenly become lost "
                                                                "or removed broken part from ZooKeeper", source_replica);