CDAP-538: Ported procedures to services of SparkKMeans app.

@ParthGandhi The SparkKMeans app has been updated to use services instead of procedures.
Parth, I followed with all previous comments and hope it's will help for review )
@tyatskiv @artemmakogon : Can I answer this. I do remember that this was required for the tests to run. But I don't remember why.