PIG-3665: TEZ-41 break pig-tez

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1558230 13f79535-47bb-0310-9956-ffa450edef68
PIG-3666: Fix store after load

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/tez@1558234 13f79535-47bb-0310-9956-ffa450edef68
PIG-3644-1
PIG-3644-2