Revert "[SPARK-21658][SQL][PYSPARK] Add default None for value in na.replace in PySpark"#20496

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HyukjinKwon wants to merge 1 commit intoapache:masterfrom HyukjinKwon:revert-SPARK-21658

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Commits on Feb 3, 2018

Revert "[SPARK-21658][SQL][PYSPARK] Add default None for value in na.replace in PySpark"
HyukjinKwon
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