[SPARK-3159][ML] Add decision tree pruning#20632

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Commits on Feb 28, 2018

[SPARK-3159][ML] Add decision tree pruning
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Commits on Mar 2, 2018

[SPARK-3159][ML] decision tree pruning, unit tests now checking the total sum of counters at leaf level
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[SPARK-3159][ML] decision tree pruning, added missing curly braces
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