[SPARK-12717][PYTHON] Adding thread-safe broadcast pickle registry#18695

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BryanCutler wants to merge 6 commits intoapache:masterfrom

BryanCutler:pyspark-bcast-threadsafe-SPARK-12717

Commits on Jul 20, 2017

Added thread-safe broadcast pickle registry
BryanCutler
committed

Commits on Jul 26, 2017

Commits on Jul 31, 2017

Commits on Aug 1, 2017

added check that pickled vars is cleared
BryanCutler
committed