PIG-4235: Fix unit test failures on Windows

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/branch-0.14@1635392 13f79535-47bb-0310-9956-ffa450edef68
PIG-4182: e2e tests Scripting_[1-12] fail on Windows

git-svn-id: https://svn.apache.org/repos/asf/pig/branches/branch-0.14@1635395 13f79535-47bb-0310-9956-ffa450edef68