**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.

size_t source_log_pointer = get_log_pointer.data.empty() ? 0 : parse<UInt64>(get_log_pointer.data);
        assert(source_log_pointer <= max_log_entry);
        size_t replica_queue_lag = max_log_entry - source_log_pointer;
        size_t replica_queue_size = get_queue.stat.numChildren;
        size_t replication_lag = replica_queue_lag + replica_queue_size;
        LOG_INFO(log, "Replica {} has log pointer '{}', approximate {} queue lag and {} queue size",
                 source_replica_name, get_log_pointer.data, replica_queue_lag, replica_queue_size);
        if (replication_lag < min_replication_lag)
        {
            source_replica = source_replica_name;
            source_is_lost_stat = get_is_lost.stat;
            min_replication_lag = replication_lag;
        }
    }
    if (source_replica.empty())
        throw Exception("All replicas are lost", ErrorCodes::ALL_REPLICAS_LOST);
    if (is_new_replica)
        LOG_INFO(log, "Will mimic {}", source_replica);
    else
        LOG_WARNING(log, "Will mimic {}", source_replica);
    
    zookeeper->removeChildren(fs::path(replica_path) / "queue");
    queue.clear();
    
    cloneReplica(source_replica, source_is_lost_stat, zookeeper);
    
    
    zookeeper->set(fs::path(replica_path) / "is_lost", "0");
}
String StorageReplicatedMergeTree::getLastQueueUpdateException() const