Squash more language feature warnings in new commits by importing implicitConversion

Author: srowen

streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaInputDStream.scala

@@ -17,6 +17,7 @@
 
 package org.apache.spark.streaming.api.java
 
+import scala.language.implicitConversions
 import scala.reflect.ClassTag
 
 import org.apache.spark.streaming.dstream.InputDStream

streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaPairInputDStream.scala

@@ -18,6 +18,8 @@
 package org.apache.spark.streaming.api.java
 
 import org.apache.spark.streaming.dstream.InputDStream
+
+import scala.language.implicitConversions
 import scala.reflect.ClassTag
 
 /**

streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaPairReceiverInputDStream.scala

@@ -17,6 +17,7 @@
 
 package org.apache.spark.streaming.api.java
 
+import scala.language.implicitConversions
 import scala.reflect.ClassTag
 
 import org.apache.spark.streaming.dstream.ReceiverInputDStream

streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaReceiverInputDStream.scala

@@ -17,6 +17,7 @@
 
 package org.apache.spark.streaming.api.java
 
+import scala.language.implicitConversions
 import scala.reflect.ClassTag
 
 import org.apache.spark.streaming.dstream.ReceiverInputDStream