CDAP-538: Ported procedures to services of SparkKMeans app; Updated scripts.
Merge remote-tracking branch 'upstream/develop' into CDAP-538-spark-k-means-app
Merge remote-tracking branch 'upstream/develop' into CDAP-538-spark-k-means-app
CDAP-538: Replaced sendError to sendString for response.
CDAP-538: Added tests for SparkKMeans app; Send response as string instead of Json.
Merge pull request #641 from cybervisiontech/CDAP-538-spark-k-means-app

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