CDK-668: Update maven plugin to setup DefaultConfiguration.

Previously, properties set in the plugin's configuration were local and
the getDatasetRepository method had to use repository builders to use
the correct file system. This updates the method to create repository
URIs instead and changes the getConf method to update the default
Configuration.
I think `location` isn't the right name for the option then. Does Hive always create the table in `/<warehouse dir>/<ns>/<table>` in which case we should use `root` or `warehouse` or something for the option.