**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.

else 
            ops.push_back(zkutil::makeCheckRequest(fs::path(source_path) / "is_lost", source_is_lost_stat.version));
        Coordination::Responses responses;
        
        source_queue_names = zookeeper->getChildren(fs::path(source_path) / "queue");
        
        ops.push_back(zkutil::makeCheckRequest(fs::path(source_path) / "log_pointer", log_pointer_stat.version));
        auto rc = zookeeper->tryMulti(ops, responses);
        if (rc == Coordination::Error::ZOK)
        {
            break;
        }
        else if (rc == Coordination::Error::ZNODEEXISTS)
        {
            throw Exception(
                "Can not clone replica, because the " + source_replica + " updated to new ClickHouse version",
                ErrorCodes::REPLICA_STATUS_CHANGED);
        }
        else if (responses[1]->error == Coordination::Error::ZBADVERSION)
        {
            
            
            throw Exception(
                "Can not clone replica, because the " + source_replica + " became lost", ErrorCodes::REPLICA_STATUS_CHANGED);
        }
        else if (responses.back()->error == Coordination::Error::ZBADVERSION)
        {
            
            
            LOG_WARNING(log, "Log pointer of source replica {} changed while we loading queue nodes. Will retry.", source_replica);