**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.

*current_metadata, query_context->getSettingsRef().materialize_ttl_after_modify, query_context);
        bool have_mutation = !maybe_mutation_commands.empty();
        alter_entry->have_mutation = have_mutation;
        alter_path_idx = ops.size();
        ops.emplace_back(zkutil::makeCreateRequest(
            fs::path(zookeeper_path) / "log/log-", alter_entry->toString(), zkutil::CreateMode::PersistentSequential));
        PartitionBlockNumbersHolder partition_block_numbers_holder;
        if (have_mutation)
        {
            const String mutations_path(fs::path(zookeeper_path) / "mutations");
            ReplicatedMergeTreeMutationEntry mutation_entry;
            mutation_entry.alter_version = new_metadata_version;
            mutation_entry.source_replica = replica_name;
            mutation_entry.commands = std::move(maybe_mutation_commands);
            Coordination::Stat mutations_stat;
            zookeeper->get(mutations_path, &mutations_stat);
            partition_block_numbers_holder =
                allocateBlockNumbersInAffectedPartitions(mutation_entry.commands, query_context, zookeeper);
            mutation_entry.block_numbers = partition_block_numbers_holder.getBlockNumbers();
            mutation_entry.create_time = time(nullptr);
            ops.emplace_back(zkutil::makeSetRequest(mutations_path, String(), mutations_stat.version));
            mutation_path_idx = ops.size();
            ops.emplace_back(
                zkutil::makeCreateRequest(fs::path(mutations_path) / "", mutation_entry.toString(), zkutil::CreateMode::PersistentSequential));
        }
        if (auto txn = query_context->getZooKeeperMetadataTransaction())
        {
            
            
            txn->moveOpsTo(ops);