Update tutorial to reflect changes to Optiq's JDBC adapter

The JSON attributes `driver`, `url`, `user` and `password` are now `jdbcDriver`, `jdbcUrl`, `jdbcUser`, `jdbcPassword`. And

``` json
factory: 'net.hydromatic.optiq.impl.jdbc.JdbcSchema.Factory'
```

should be

``` json
factory: 'net.hydromatic.optiq.impl.jdbc.JdbcSchema$Factory'
```

See also https://github.com/julianhyde/optiq/issues/144.
