PIG-3822: Remove reference to BroadcastKVReader as it is removed in TEZ-911 (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1579458 13f79535-47bb-0310-9956-ffa450edef68
PIG-3789: tuple in POStream binaryInputQueue keep changing

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1579463 13f79535-47bb-0310-9956-ffa450edef68