**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.

if (!covering_drop_range.empty())
        {
            LOG_TRACE(log, "{} {}: it's covered by DROP_RANGE {}", log_msg_context, part_name, covering_drop_range);
            return true;
        }
        
        
        
        String covering_get_part_entry = get_part_set.getContainingPart(part_name);
        if (covering_get_part_entry.empty())
            return false;
        if (covering_get_part_entry != part_name)
        {
            LOG_TRACE(log, "{} {}: it's covered by GET_PART {}", log_msg_context, part_name, covering_get_part_entry);
            return true;
        }
        
        
        
        
        
        if (created_gets.count(part_name))
        {
            
            
            
            LOG_TRACE(log, "{} {}: GET_PART for it is already created", log_msg_context, part_name);
            return true;
        }
        return false;