Hive repositories should open any Kite/Hive table.

When using the CLI, it makes sense to add --directory when creating a Dataset. But when showing a Dataset, it isn't obvious, and the error for Hive tables when it is missing is that the "table is not external" or "table is not managed". Hive tables share a namespace, so managed repos should be able to open external tables and vice versa. The distinction should be where tables are created by default and shouldn't be needlessly limiting.