CDK-514: Use views

It was producing unnecessary messages, like "External URI options: ..." from the loader. When we added the log4j config, the intent was to show enough of what is going on to aid understanding, but the messages shown weren't doing that and were distracting / confusing instead. That's why I switched to DEBUG on just the component I want to show the behavior of, the `FileSystemDatasetReader` that is only opening matching files.