HIVE-5734: Enable merge/move tasks for Tez (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1538485 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5735: Enable noscan/partialscan on Tez (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1538503 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5736: Fix assertion in Operator.java (Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/tez@1538509 13f79535-47bb-0310-9956-ffa450edef68