HIVE-4743 : Improve test coverage of package org.apache.hadoop.hive.ql.io (Ivan Veselovsky via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1495462 13f79535-47bb-0310-9956-ffa450edef68
HIVE-4767 : ObjectStore.getPMF has concurrency problems (Brock Noland via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1495464 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HIVE-4743-trunk-gd