PIG-3780: Tez mini cluster tests run for a very long time with TezSession reuse on (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1572357 13f79535-47bb-0310-9956-ffa450edef68
PIG-3781: Fix TestTezCompiler#testReplicatedJoinInReducer (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1572442 13f79535-47bb-0310-9956-ffa450edef68