HIVE-5474 : drop table hangs when concurrency=true (Jason Dere via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1531704 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5496 : hcat -e drop database if exists fails on authorizing non-existent null db (Sushanth Sowmyan via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1531706 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5485 : SBAP errors on null partition being passed into partition level authorization (Sushanth Sowmyan via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1531707 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5479 : SBAP restricts hcat -e show databases (Sushanth Sowmyan via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1531708 13f79535-47bb-0310-9956-ffa450edef68