Update LBFGSSuite.scala

the same reason as apache#588

Author: baishuo(白硕) <[email protected]>

Closes apache#815 from baishuo/master and squashes the following commits:

6876c1e [baishuo(白硕)] Update LBFGSSuite.scala

Author: baishuo

mllib/src/test/scala/org/apache/spark/mllib/optimization/LBFGSSuite.scala

@@ -43,7 +43,7 @@ class LBFGSSuite extends FunSuite with LocalSparkContext with ShouldMatchers {
   // Add an extra variable consisting of all 1.0's for the intercept.
   val testData = GradientDescentSuite.generateGDInput(A, B, nPoints, 42)
   val data = testData.map { case LabeledPoint(label, features) =>
-    label -> Vectors.dense(1.0, features.toArray: _*)
+    label -> Vectors.dense(1.0 +: features.toArray)
   }
 
   lazy val dataRDD = sc.parallelize(data, 2).cache()
@@ -55,7 +55,7 @@ class LBFGSSuite extends FunSuite with LocalSparkContext with ShouldMatchers {
   test("LBFGS loss should be decreasing and match the result of Gradient Descent.") {
     val regParam = 0
 
-    val initialWeightsWithIntercept = Vectors.dense(1.0, initialWeights: _*)
+    val initialWeightsWithIntercept = Vectors.dense(1.0 +: initialWeights.toArray)
     val convergenceTol = 1e-12
     val maxNumIterations = 10