HIVE-9059: Remove wrappers for SparkJobInfo and SparkStageInfo [Spark Branch]

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646290 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8972: Implement more fine-grained remote client-level events [Spark Branch] (Rui via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646335 13f79535-47bb-0310-9956-ffa450edef68
HIVE-8843: Release RDD cache when Hive query is done [Spark Branch] (Jimmy via Xuefu)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/spark@1646336 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'upstream/spark' into spark