[SPARK-21306][ML] For branch 2.0, OneVsRest should support setWeightCol#18764

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facaiy wants to merge 5 commits intoapache:branch-2.0from

facaiy:BUG/branch-2.0_OneVsRest_support_setWeightCol

Commits on Jul 28, 2017

Commits on Aug 1, 2017

BUG: classifier is empty string
facaiy
committed

Commits on Aug 5, 2017

BUG: py2.6 ValueError: zero length field name in format
facaiy
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