**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.

for (size_t i = 0; i < source_queue_names.size(); ++i)
        {
            auto res = queue_get_futures[i].get();
            
            if (res.error == Coordination::Error::ZNONODE)
                continue;
            assert(res.error == Coordination::Error::ZOK);
            source_queue.emplace_back();
            auto & info = source_queue.back();
            info.data = std::move(res.data);
            info.stat = std::move(res.stat);
            try
            {
                info.parsed_entry = LogEntry::parse(info.data, info.stat);
            }
            catch (...)
            {
                tryLogCurrentException(log, "Cannot parse source queue entry " + source_queue_names[i]);
            }
            
            if (!info.parsed_entry)
                continue;
            info.parsed_entry->znode_name = source_queue_names[i];
            if (info.parsed_entry->type == LogEntry::DROP_RANGE)
                drop_range_set.add(info.parsed_entry->new_part_name);
            if (info.parsed_entry->type == LogEntry::GET_PART)
            {
                String maybe_covering_drop_range = drop_range_set.getContainingPart(info.parsed_entry->new_part_name);
                if (maybe_covering_drop_range.empty())
                    get_part_set.add(info.parsed_entry->new_part_name);