**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.

{
    String source_path = fs::path(zookeeper_path) / "replicas" / source_replica;
    
    Strings source_queue_names;
    
    
    while (true)
    {
        Coordination::Stat log_pointer_stat;
        String raw_log_pointer = zookeeper->get(fs::path(source_path) / "log_pointer", &log_pointer_stat);
        Coordination::Requests ops;
        ops.push_back(zkutil::makeSetRequest(fs::path(replica_path) / "log_pointer", raw_log_pointer, -1));
        
        if (source_is_lost_stat.version == -1)
        {
            
            
            ops.push_back(zkutil::makeCreateRequest(fs::path(source_path) / "is_lost", "0", zkutil::CreateMode::Persistent));
            ops.push_back(zkutil::makeRemoveRequest(fs::path(source_path) / "is_lost", -1));
        }