fix import

Author: DB Tsai

mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala

@@ -26,12 +26,12 @@ import breeze.optimize.{CachedDiffFunction, DiffFunction}
 import org.apache.spark.annotation.AlphaComponent
 import org.apache.spark.ml.param._
 import org.apache.spark.ml.param.shared._
+import org.apache.spark.mllib.linalg._
 import org.apache.spark.mllib.linalg.BLAS._
 import org.apache.spark.mllib.regression.LabeledPoint
 import org.apache.spark.mllib.stat.MultivariateOnlineSummarizer
 import org.apache.spark.mllib.util.MLUtils
 import org.apache.spark.rdd.RDD
-import org.apache.spark.mllib.linalg._
 import org.apache.spark.sql.DataFrame
 import org.apache.spark.storage.StorageLevel
 import org.apache.spark.{SparkException, Logging}