[SPARK-21685][PYTHON][ML] PySpark Params isSet state should not change after transform#18982

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BryanCutler wants to merge 15 commits intoapache:masterfrom

BryanCutler:pyspark-ml-param-to-java-defaults-SPARK-21685

Commits on Aug 18, 2017

added regression test for preserving Param set state when transferring to Java
BryanCutler
committed
changed _transfer_params_to_java to not set param in Java unless explicitly set
BryanCutler
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Commits on Sep 6, 2017

Commits on Sep 9, 2017

Commits on Nov 20, 2017

Commits on Feb 8, 2018