CDAP-713: Updated SparkPageRank archetype according to migration to services.

@rohitsinha54 @sreevatsanraman The archetypes of SparkPageRank app have been updated regarding to migration from procedures to services. Scripts also have been updated (same as in #704). Please take a look.
OK, that's fine. But please fix the comment line (152); perhaps say:
Only status or stop for Spark Programs; start controlled by run option