[SPARK-23698][Python] Resolve undefined names in Python 3#20838

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cclauss wants to merge 9 commits intoapache:masterfrom

cclauss:fix-undefined-names

Commits on Aug 18, 2018

[SPARK-23698] Reduce undefined names in Python 3
cclauss
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add test_slice() to python/pyspark/streaming/tests.py
cclauss
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five_secs = dt.timedelta(seconds=5)
cclauss
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Remove comment
cclauss
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dstream.slice() returns a list of lists
cclauss
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Remove definition of long for Python 3
cclauss
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restore definition of long and test_slice()
cclauss
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Commits on Aug 21, 2018

Replacing test_slice() with new implementation
cclauss
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Fix redundant import and typo in comment
cclauss
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