PIG-3728: Fix TestSkewedJoin in tez mode (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1562110 13f79535-47bb-0310-9956-ffa450edef68
PIG-3728: Fix TestSkewedJoin in tez mode (hotfix)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1562128 13f79535-47bb-0310-9956-ffa450edef68