removed private from naive bayes constructor for lambda only

Author: leahmcguire

mllib/src/main/scala/org/apache/spark/mllib/classification/NaiveBayes.scala

@@ -186,7 +186,7 @@ class NaiveBayes private (
     private var lambda: Double,
     private var modelType: NaiveBayes.ModelType) extends Serializable with Logging {
 
-  private def this(lambda: Double) = this(lambda, NaiveBayes.Multinomial)
+  def this(lambda: Double) = this(lambda, NaiveBayes.Multinomial)
 
   def this() = this(1.0, NaiveBayes.Multinomial)