[Spark-12732][ML] bug fix in linear regression train#10702

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iyounus wants to merge 8 commits intoapache:masterfrom

iyounus:SPARK-12732_bug_fix_in_linear_regression_train

Commits on Jan 20, 2016

Commits on Jan 21, 2016

added exception for ill-defined case of constant label with regParam=0, standardization=true and fitIntercept=false. added test for this case. Modified existing test for constant label.
iyounus
committed

Commits on Jan 30, 2016

fixed the case with yStd==0, regParam!=0 and standardization=true/false. Also, if yMean==0 and yStd==0, no training is done.
iyounus
committed

Commits on Jan 31, 2016

Commits on Feb 2, 2016