PIG-4067: TestAllLoader in piggybank fails with new hive version (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1612865 13f79535-47bb-0310-9956-ffa450edef68
PIG-4068: ObjectCache causes ClassCastException (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1612980 13f79535-47bb-0310-9956-ffa450edef68