**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.

auto order_by_ast = parse_key_expr(metadata_diff.new_sorting_key);
            auto & sorting_key = new_metadata.sorting_key;
            auto & primary_key = new_metadata.primary_key;
            sorting_key.recalculateWithNewAST(order_by_ast, new_metadata.columns, getContext());
            if (primary_key.definition_ast == nullptr)
            {
                
                
                auto old_sorting_key_ast = old_metadata.getSortingKey().definition_ast;
                primary_key = KeyDescription::getKeyFromAST(
                    old_sorting_key_ast, new_metadata.columns, getContext());
            }
        }
        if (metadata_diff.sampling_expression_changed)
        {
            if (!metadata_diff.new_sampling_expression.empty())
            {
                auto sample_by_ast = parse_key_expr(metadata_diff.new_sampling_expression);
                new_metadata.sampling_key.recalculateWithNewAST(sample_by_ast, new_metadata.columns, getContext());
            }
            else 
            {
                new_metadata.sampling_key = {};
            }
        }
        if (metadata_diff.skip_indices_changed)
            new_metadata.secondary_indices = IndicesDescription::parse(metadata_diff.new_skip_indices, new_columns, getContext());
        if (metadata_diff.constraints_changed)
            new_metadata.constraints = ConstraintsDescription::parse(metadata_diff.new_constraints);
        if (metadata_diff.projections_changed)