PIG-4025: TestLoadFuncWrapper, TestLoadFuncMetaDataWrapper,TestStoreFuncWrapper and TestStoreFuncMetadataWrapper fail on IBM JDK

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1605660 13f79535-47bb-0310-9956-ffa450edef68
PIG-2122: Parameter Substitution doesn't work in the Grunt shell

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1605661 13f79535-47bb-0310-9956-ffa450edef68
PIG-4038: SPRINTF should return NULL on any NULL input

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1605662 13f79535-47bb-0310-9956-ffa450edef68