HIVE-7665 - Create TestSparkCliDriver to run test in spark local mode (Szehon via Brock) [Spark Branch]

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1617394 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7626 : Reduce operator initialization failed when running mulitple MR query on spark (Rui Li via Szehon) [Spark Branch]

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1617420 13f79535-47bb-0310-9956-ffa450edef68