**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.

external_user_defined_executable_functions_loader.reset();
            models_repository_guard.reset();
            external_models_loader.reset();
            buffer_flush_schedule_pool.reset();
            schedule_pool.reset();
            distributed_schedule_pool.reset();
            message_broker_schedule_pool.reset();
            ddl_worker.reset();
            access_control_manager.reset();
            
            trace_collector.reset();
            
            zookeeper.reset();
        }
        
        delete_system_logs.reset();
    }
    bool hasTraceCollector() const
    {
        return trace_collector.has_value();
    }
    void initializeTraceCollector(std::shared_ptr<TraceLog> trace_log)
    {
        if (!trace_log)
            return;
        if (hasTraceCollector())
            return;
        trace_collector.emplace(std::move(trace_log));
    }
    void addWarningMessage(const String & message)