[SPARK-22417][PYTHON] Fix for createDataFrame from pandas.DataFrame with timestamp#19646

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BryanCutler wants to merge 4 commits intoapache:masterfrom

BryanCutler:pyspark-non-arrow-createDataFrame-ts-fix-SPARK-22417

Commits on Nov 2, 2017

Commits on Nov 3, 2017

moved conversion to internal methods
BryanCutler
committed

Commits on Nov 6, 2017

use datetime64 instead of M8, minor fixes
BryanCutler
committed