[FIX][MLLIB] Use SquaredL2Updater in LogisticRegressionWithSGD

SimpleUpdater ignores the regularizer, which leads to an unregularized LogReg. To enable the common L2 regularizer (and the corresponding regularization parameter) for logistic regression the SquaredL2Updater has to be used in SGD (see, e.g., [SVMWithSGD])
Shall we change `regularizer` to `regParam` to be more specific?