**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.

entry.new_part_name = drop_range_fake_part_name;
    entry.detach = detach;
    entry.create_time = time(nullptr);
    Coordination::Requests ops;
    ops.emplace_back(zkutil::makeCreateRequest(fs::path(zookeeper_path) / "log/log-", entry.toString(),
        zkutil::CreateMode::PersistentSequential));
    
    
    
    ops.emplace_back(zkutil::makeSetRequest(alter_partition_version_path, "", alter_partition_version_stat.version));
    
    ops.emplace_back(zkutil::makeSetRequest(fs::path(zookeeper_path) / "log", "", -1));
    delimiting_block_lock->getUnlockOps(ops);
    if (auto txn = query_context->getZooKeeperMetadataTransaction())
        txn->moveOpsTo(ops);
    Coordination::Responses responses;
    Coordination::Error code = zookeeper.tryMulti(ops, responses);
    if (code == Coordination::Error::ZOK)
        delimiting_block_lock->assumeUnlocked();
    else if (code == Coordination::Error::ZBADVERSION)
        throw Exception(ErrorCodes::CANNOT_ASSIGN_ALTER,
            "Cannot assign ALTER PARTITION because another ALTER PARTITION query was concurrently executed");
    else
        zkutil::KeeperMultiException::check(code, ops, responses);
    String log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*responses.front()).path_created;
    entry.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
    getContext()->getMergeList().cancelInPartition(getStorageID(), partition_id, drop_range_info.max_block);
    return true;
}
CheckResults StorageReplicatedMergeTree::checkData(const ASTPtr & query, ContextPtr local_context)