HIVE-5832: Add shutdown hook to stop tez dag/session if jvm dies (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1542206 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5834: Avoid reading ORC footers for files which will not be split in OrcInputFormat::getSplits() (Gopal V via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1542424 13f79535-47bb-0310-9956-ffa450edef68