**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.

log_node_name = entry.znode_name;
        LOG_DEBUG(log, "Waiting for {} to pull {} to queue", replica, log_node_name);
        
        bool pulled_to_queue = false;
        do
        {
            zkutil::EventPtr event = std::make_shared<Poco::Event>();
            String log_pointer = getZooKeeper()->get(fs::path(table_zookeeper_path) / "replicas" / replica / "log_pointer", nullptr, event);
            if (!log_pointer.empty() && parse<UInt64>(log_pointer) > log_index)
            {
                pulled_to_queue = true;
                break;
            }
            
            
            
            
            if (!stop_waiting())
                event->tryWait(event_wait_timeout_ms);
        } while (!stop_waiting());
        if (!pulled_to_queue)
            return false;
        LOG_DEBUG(log, "Looking for node corresponding to {} in {} queue", log_node_name, replica);
    }
    else if (!entry.log_entry_id.empty())
    {
        
        
        
        LOG_DEBUG(log, "Looking for log entry with id `{}` in the log", entry.log_entry_id);