**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.

{
    auto zookeeper = getZooKeeper();
    
    const String quorum_last_part_path = fs::path(zookeeper_path) / "quorum" / "last_part";
    
    while (true)
    {
        Coordination::Stat added_parts_stat;
        String old_added_parts = zookeeper->get(quorum_last_part_path, &added_parts_stat);
        ReplicatedMergeTreeQuorumAddedParts parts_with_quorum(format_version);
        if (!old_added_parts.empty())
            parts_with_quorum.fromString(old_added_parts);
        
        if (!parts_with_quorum.added_parts.count(partition_id))
        {
            
            break;
        }
        parts_with_quorum.added_parts.erase(partition_id);
        String new_added_parts = parts_with_quorum.toString();
        auto code = zookeeper->trySet(quorum_last_part_path, new_added_parts, added_parts_stat.version);
        if (code == Coordination::Error::ZOK)
        {
            break;
        }
        else if (code == Coordination::Error::ZNONODE)
        {
            
            break;