**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.

dummy_alter.metadata_str = source_metadata;
    dummy_alter.columns_str = source_columns;
    dummy_alter.alter_version = source_metadata_version;
    dummy_alter.create_time = time(nullptr);
    zookeeper->create(replica_path + "/queue/queue-", dummy_alter.toString(), zkutil::CreateMode::PersistentSequential);
    
    
    
}
void StorageReplicatedMergeTree::cloneReplicaIfNeeded(zkutil::ZooKeeperPtr zookeeper)
{
    Coordination::Stat is_lost_stat;
    bool is_new_replica = true;
    String res;
    if (zookeeper->tryGet(fs::path(replica_path) / "is_lost", res, &is_lost_stat))
    {
        if (res == "0")
            return;
        if (is_lost_stat.version)
            is_new_replica = false;
    }
    else
    {
        
        
        
        zookeeper->create(fs::path(replica_path) / "is_lost", "0", zkutil::CreateMode::Persistent);
        return;
    }