[SPARK-7085][MLlib] Fix miniBatchFraction parameter in train method called with 4 arguments

Author: wizz <wizz@wizz-dev01.kawasaki.flab.fujitsu.com>

Closes #5658 from kuromatsu-nobuyuki/SPARK-7085 and squashes the following commits:

6ec2d21 [wizz] Fix miniBatchFraction parameter in train method called with 4 arguments

mllib/src/main/scala/org/apache/spark/mllib/regression/RidgeRegression.scala

@@ -171,7 +171,7 @@ object RidgeRegressionWithSGD {
       numIterations: Int,
       stepSize: Double,
       regParam: Double): RidgeRegressionModel = {
-    train(input, numIterations, stepSize, regParam, 0.01)
+    train(input, numIterations, stepSize, regParam, 1.0)
   }
 
   /**