PIG-4056: Remove PhysicalOperator.setAlias (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1611482 13f79535-47bb-0310-9956-ffa450edef68
PIG-2689: JsonStorage fails to find schema when LimitAdjuster runs (rohini)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1611505 13f79535-47bb-0310-9956-ffa450edef68