PIG-3360: Some intermittent negative e2e tests fail on hadoop 2

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/branch-0.12@1528710 13f79535-47bb-0310-9956-ffa450edef68
PIG-3494: Several fixes for e2e tests

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/branch-0.12@1528711 13f79535-47bb-0310-9956-ffa450edef68