**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.

Coordination::Stat stat;
    if (zookeeper->tryGet(quorum_status_path, value, &stat))
    {
        ReplicatedMergeTreeQuorumEntry quorum_entry;
        quorum_entry.fromString(value);
        auto part_info = MergeTreePartInfo::fromPartName(quorum_entry.part_name, format_version);
        max_added_blocks[part_info.partition_id] = part_info.max_block - 1;
    }
    String added_parts_str;
    if (zookeeper->tryGet(fs::path(zookeeper_path) / "quorum" / "last_part", added_parts_str))
    {
        if (!added_parts_str.empty())
        {
            ReplicatedMergeTreeQuorumAddedParts part_with_quorum(format_version);
            part_with_quorum.fromString(added_parts_str);
            auto added_parts = part_with_quorum.added_parts;
            for (const auto & added_part : added_parts)
                if (!getActiveContainingPart(added_part.second))
                    throw Exception(
                        "Replica doesn't have part " + added_part.second
                            + " which was successfully written to quorum of other replicas."
                              " Send query to another replica or disable 'select_sequential_consistency' setting.",
                        ErrorCodes::REPLICA_IS_NOT_IN_QUORUM);
            for (const auto & max_block : part_with_quorum.getMaxInsertedBlocks())
                max_added_blocks[max_block.first] = max_block.second;
        }
    }
    return max_added_blocks;
}
void StorageReplicatedMergeTree::read(