HIVE-6884 : HiveLockObject and enclosed HiveLockObjectData override equal() method but didn't do so for hashcode() (Xuefu Zhang via Ashutosh Chauhan)

git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1590998 13f79535-47bb-0310-9956-ffa450edef68