CDK-514: Use views

I agree that there is no need for the examples that run against the local FS. But FS selection is based on URI rather than the default FS setting. All this does is add the default authority, so `hdfs:/` resolves to `hdfs://localhost.localdomain/` rather than causing an error. That way, users expect HDFS to be configure in their environment rather than configuring it in their dataset URIs.