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.
I thought we are getting rid of script like to favor the use of CLI, isn't it? @nitinmotgi ?