PIG-3977: Get TezStats working for Oozie (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1637447 13f79535-47bb-0310-9956-ffa450edef68
PIG-4298: Descending order-by is broken in some cases when key is bytearrays (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1637467 13f79535-47bb-0310-9956-ffa450edef68
PIG-4299: SpillableMemoryManager assumes tenured heap incorrectly

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1637483 13f79535-47bb-0310-9956-ffa450edef68