PIG-3610: Fix e2e tests Operators_3, Operators_5, Join_1

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1547973 13f79535-47bb-0310-9956-ffa450edef68
PIG-3611: Add order by string, descending order e2e tests

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1548016 13f79535-47bb-0310-9956-ffa450edef68