**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.

const String & last_log_entry = *std::max_element(log_entries.begin(), log_entries.end());
                res.log_max_index = parse<UInt64>(last_log_entry.substr(strlen("log-")));
            }
            String log_pointer_str = zookeeper->get(fs::path(replica_path) / "log_pointer");
            res.log_pointer = log_pointer_str.empty() ? 0 : parse<UInt64>(log_pointer_str);
            auto all_replicas = zookeeper->getChildren(fs::path(zookeeper_path) / "replicas");
            res.total_replicas = all_replicas.size();
            for (const String & replica : all_replicas)
            {
                bool is_replica_active = zookeeper->exists(fs::path(zookeeper_path) / "replicas" / replica / "is_active");
                res.active_replicas += static_cast<UInt8>(is_replica_active);
                res.replica_is_active.emplace(replica, is_replica_active);
            }
        }
        catch (const Coordination::Exception &)
        {
            res.zookeeper_exception = getCurrentExceptionMessage(false);
        }
    }
}
void StorageReplicatedMergeTree::getQueue(LogEntriesData & res, String & replica_name_)
{
    replica_name_ = replica_name;
    queue.getEntries(res);
}
std::vector<PartMovesBetweenShardsOrchestrator::Entry> StorageReplicatedMergeTree::getPartMovesBetweenShardsEntries()
{
    return part_moves_between_shards_orchestrator.getEntries();
}
time_t StorageReplicatedMergeTree::getAbsoluteDelay() const