[SPARK-13777] [ML] Remove constant features from training in normal solver (WLS)#11610

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iyounus wants to merge 3 commits intoapache:masterfrom

iyounus:SPARK-13777_WLS_fix_for_constant_features

Commits on Mar 9, 2016

remove constant features from training in noraml solver
iyounus
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Commits on Mar 12, 2016

incorporating suggestionsmade by sethah
iyounus
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Commits on Mar 14, 2016

removing use of .values when getting arrays from DenseVector
iyounus
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