HIVE-3764 : Support metastore version consistency check (Prasad Mujumdar via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1526348 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5329 : Date and timestamp type converts invalid strings to 1970-01-01 (Jason Dere via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1526351 13f79535-47bb-0310-9956-ffa450edef68
HIVE-5301 : Add a schema tool for offline metastore schema upgrade (Prasad Mujumdar via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/branches/branch-0.12@1526363 13f79535-47bb-0310-9956-ffa450edef68