PIG-3985: Multiquery execution of RANK with RANK BY causes NPE (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1629020 13f79535-47bb-0310-9956-ffa450edef68
PIG-4196: Auto ship udf jar is broken

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1629110 13f79535-47bb-0310-9956-ffa450edef68