**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.

part_names.emplace_back(part->name);
            
            
            
            
            
            
            
            
            throw Exception(ErrorCodes::INCORRECT_DATA, "Tried to create empty part {}, but it replaces existing parts {}.", lost_part_name, fmt::join(part_names, ", "));
        }
        while (true)
        {
            Coordination::Requests ops;
            Coordination::Stat replicas_stat;
            auto replicas_path = fs::path(zookeeper_path) / "replicas";
            Strings replicas = zookeeper->getChildren(replicas_path, &replicas_stat);
            
            ops.emplace_back(zkutil::makeCheckRequest(replicas_path, replicas_stat.version));
            for (const String & replica : replicas)
            {
                String current_part_path = fs::path(zookeeper_path) / "replicas" / replica / "parts" / lost_part_name;
                
                if (!zookeeper->exists(current_part_path))
                {
                    ops.emplace_back(zkutil::makeCreateRequest(current_part_path, "", zkutil::CreateMode::Persistent));
                    ops.emplace_back(zkutil::makeRemoveRequest(current_part_path, -1));
                }
                else
                {