PIG-4145: Port local mode tests to Tez - part1

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PIG-4144: Make pigunit.PigTest work in tez mode

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PIG-4146: Create a target to run mr and tez unit test in one shot

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PIG-4149: Rounding issue in FindQuantiles

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PIG-4143: Port more mini cluster tests to Tez - part 7

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PIG-4143: Port more mini cluster tests to Tez - part 7

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PIG-4153: Pin Tez to 0.5.0 release (cheolsoo)


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Merge latest trunk changes


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