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.
This is an archetype (?) so I guess makes sense to not assume they have CLI installed. Anyway I think there are still quite a few instances of `app-manager.{sh,bat}` in our codebase - makes sense to change in a later PR.