**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_DEBUG(log, "Part {} of {} has inappropriate checksum", part_desc->src_part_name, source_table_id.getNameForLogs());
                
                continue;
            }
            part_desc->found_new_part_name = part_desc->new_part_name;
            part_desc->found_new_part_info = part_desc->new_part_info;
            part_desc->src_table_part = src_part;
            ++num_clonable_parts;
        }
        return num_clonable_parts;
    };
    size_t num_clonable_parts = clone_data_parts_from_source_table();
    LOG_DEBUG(log, "Found {} parts that could be cloned (of {} required parts)", num_clonable_parts, parts_to_add.size());
    ActiveDataPartSet adding_parts_active_set(format_version);
    std::unordered_map<String, PartDescriptionPtr> part_name_to_desc;
    for (PartDescriptionPtr & part_desc : parts_to_add)
    {
        if (part_desc->src_table_part)
        {
            
            adding_parts_active_set.add(part_desc->new_part_name);
            part_name_to_desc.emplace(part_desc->new_part_name, part_desc);
            continue;
        }
        
        String replica = findReplicaHavingPart(part_desc->new_part_name, true);
        String found_part_name;
        
        if (replica.empty())
        {