**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 part_path = fs::path(replica_path) / "parts" / part_name;
    Coordination::Requests ops;
    time_t part_create_time = 0;
    Coordination::Stat stat;
    if (zookeeper->exists(part_path, &stat))
    {
        
        
        
        Coordination::Stat is_lost_stat;
        String is_lost_value = zookeeper->get(replica_path + "/is_lost", &is_lost_stat);
        assert(is_lost_value == "0");
        ops.emplace_back(zkutil::makeSetRequest(replica_path + "/is_lost", is_lost_value, is_lost_stat.version));
        part_create_time = stat.ctime / 1000;
        removePartFromZooKeeper(part_name, ops, stat.numChildren > 0);
    }
    LogEntryPtr log_entry = std::make_shared<LogEntry>();
    log_entry->type = LogEntry::GET_PART;
    log_entry->create_time = part_create_time;
    log_entry->source_replica = "";
    log_entry->new_part_name = part_name;
    ops.emplace_back(zkutil::makeCreateRequest(
        fs::path(replica_path) / "queue/queue-", log_entry->toString(),
        zkutil::CreateMode::PersistentSequential));
    auto results = zookeeper->multi(ops);
    String path_created = dynamic_cast<const Coordination::CreateResponse &>(*results.back()).path_created;
    log_entry->znode_name = path_created.substr(path_created.find_last_of('/') + 1);
    queue.insert(zookeeper, log_entry);
}
void StorageReplicatedMergeTree::enterLeaderElection()