[SPARK-26754][PYTHON] Add hasTrainingSummary to replace duplicate code in PySpark#23676

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huaxingao:spark26754

Commits on Jan 28, 2019

[SPARK-26754][PYTHON] Add hasTrainingSummary to replace duplicate code in PySpark
huaxingao
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Commits on Jan 30, 2019

address comments and fix python 2.7 problem
huaxingao
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