PIG-3595: Port Package refactoring to Tez branch (mwagner via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1546314 13f79535-47bb-0310-9956-ffa450edef68
PIG-3527: Allow PigProcessor to handle multiple inputs (mwagner via cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1546477 13f79535-47bb-0310-9956-ffa450edef68
PIG-3601: Move POSimpleTezLoad under tez package (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1546489 13f79535-47bb-0310-9956-ffa450edef68