PIG-3800: Documentation for Pig whitelist and blacklist features (prkommireddi)

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PIG-3967: Grunt fail if we running more statement after first store

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PIG-3679: e2e StreamingPythonUDFs_10 fails in trunk (addendum commit for backward compatibility)


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PIG-3874: FileLocalizer temp path can sometimes be non-unique (chitnis via cheolsoo)


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