PIG-3590 didn't delete TestPartitionFilterPushDown.java properly. Deleting it
now.


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1553889 13f79535-47bb-0310-9956-ffa450edef68
PIG-3608 didn't update CHANGES.txt. Updating it now.


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1553992 13f79535-47bb-0310-9956-ffa450edef68