**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.

return true;
        }
    }
    if (entry.type == LogEntry::ATTACH_PART)
    {
        if (MutableDataPartPtr part = attachPartHelperFoundValidPart(entry); part)
        {
            LOG_TRACE(log, "Found valid local part for {}, preparing the transaction", part->name);
            Transaction transaction(*this);
            renameTempPartAndReplace(part, nullptr, &transaction);
            checkPartChecksumsAndCommit(transaction, part);
            writePartLog(PartLogElement::Type::NEW_PART, {}, 0 ,
                part->name, part, {} , nullptr);
            return true;
        }
        LOG_TRACE(log, "Didn't find valid local part for {} ({}), will fetch it from other replica",
            entry.new_part_name,
            entry.actual_new_part_name);
    }
    if (is_get_or_attach && entry.source_replica == replica_name)
        LOG_WARNING(log, "Part {} from own log doesn't exist.", entry.new_part_name);
    
    
    if (entry.quorum && getZooKeeper()->exists(fs::path(zookeeper_path) / "quorum" / "failed_parts" / entry.new_part_name))
    {
        LOG_DEBUG(log, "Skipping action for part {} because quorum for that part was failed.", entry.new_part_name);
        return true;    
    }
    
    switch (entry.type)