Address CR comments

Author: mahithsuresh

src/main/java/com/amazonaws/sagemaker/type/AdditionalMediaType.java

@@ -23,7 +23,6 @@ public final class AdditionalMediaType {
 
     public static final String TEXT_CSV_VALUE = "text/csv";
     public static final String APPLICATION_JSONLINES_VALUE = "application/jsonlines";
-    public static final String APPLICATION_JSONLINES_VALUE_MULTIPLE ="application/jsonlines;data=multiline";
     public static final String APPLICATION_JSONLINES_TEXT_VALUE = "application/jsonlines;data=text";
 
 }

src/test/java/com/amazonaws/sagemaker/controller/ServingControllerTest.java

@@ -39,7 +39,6 @@
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.junit.runners.Parameterized;
 import org.mockito.Mockito;
 import org.powermock.api.mockito.PowerMockito;
 import org.powermock.core.classloader.annotations.PrepareForTest;
@@ -49,7 +48,7 @@
 
 @RunWith(PowerMockRunner.class)
 @PrepareForTest({ScalaUtils.class, SystemUtils.class})
-public class ServingControllerTest {
+class ServingControllerTest {
 
     private ServingController controller;
     private DataConversionHelper converter = new DataConversionHelper(new LeapFrameBuilderSupport(),