HIVE-7839 - Update union_null results now that it's deterministic [Spark Branch] (Brock via Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1619945 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7791 - Enable tests on Spark branch (1) [Sparch Branch] (Brock reviewed by Szehon)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1620091 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7821 - StarterProject: enable groupby4.q [Sparck Branch] (Suhas Satish via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1620092 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7861 - Enable reduce-side join tests (1) [Spark Branch] (Szehon via Brock)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1620093 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7792: Enable tests on Spark branch (2) [Spark Branch]