HIVE-7005: MiniTez tests have non-deterministic explain plans (Gunther Hagleitner, reviewed by Jason Dere)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1602652 13f79535-47bb-0310-9956-ffa450edef68
HIVE-7204: Use NULL vertex location hint for Prewarm DAG vertices (Gopal V via Gunther Hagleitner)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1602653 13f79535-47bb-0310-9956-ffa450edef68