CDK-604: Implemented review feedback

* Improved consistency of parameter names and descriptions.
* Updated default values.
* Added logging tests with Hive URIs.
* Added additional CLI test for flume config.
CDK-604: More review feedback

* Renamed getRepoUri() to getLegacyRepoUri()
* Updated example invocations for help text
CDK-604: Additional review feedback.

* Added a comment to the setting for dataDirs to make it clear how to set it
  if the user is new to Flume.