**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_entry.new_part_name = name;
        log_entry.create_time = tryGetPartCreateTime(zookeeper, source_path, name);
        LOG_TEST(log, "Enqueueing {} for fetch", name);
        zookeeper->create(fs::path(replica_path) / "queue/queue-", log_entry.toString(), zkutil::CreateMode::PersistentSequential);
        created_get_parts.insert(name);
    }
    size_t total_parts_to_fetch = created_get_parts.size();
    LOG_DEBUG(log, "Queued {} parts to be fetched, {} parts ignored", total_parts_to_fetch, active_parts.size() - total_parts_to_fetch);
    
    size_t total_entries_to_copy = 0;
    for (const auto & entry_info : source_queue)
    {
        assert(!entry_info.data.empty());
        if (entry_info.parsed_entry && !entry_info.parsed_entry->new_part_name.empty())
        {
            const String & part_name = entry_info.parsed_entry->new_part_name;
            const String & entry_name = entry_info.parsed_entry->znode_name;
            const auto & entry_type = entry_info.parsed_entry->type;
            if (should_ignore_log_entry(created_get_parts, part_name, fmt::format("Not copying {} {} ", entry_name, entry_type)))
                continue;
            if (entry_info.parsed_entry->type == LogEntry::GET_PART)
                created_get_parts.insert(part_name);
        }
        LOG_TEST(log, "Copying entry {}", entry_info.data);
        zookeeper->create(fs::path(replica_path) / "queue/queue-", entry_info.data, zkutil::CreateMode::PersistentSequential);
        ++total_entries_to_copy;
    }
    LOG_DEBUG(log, "Copied {} queue entries, {} entries ignored", total_entries_to_copy, source_queue.size() - total_entries_to_copy);
}
void StorageReplicatedMergeTree::cloneMetadataIfNeeded(const String & source_replica, const String & source_path, zkutil::ZooKeeperPtr & zookeeper)