PIG-3522: Remove shock from pig

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1538093 13f79535-47bb-0310-9956-ffa450edef68
PIG-3559: Trunk is broken by PIG-3522 (cheolsoo)


git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1538250 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of https://github.com/apache/pig into storm-integration
updated executionengine to handle interface update