SPARK-1488. Squash more language feature warnings in new commits by importing implicitConversion

A recent commit reintroduced some of the same warnings that SPARK-1488 resolved. These are just a few more of the same changes to remove these warnings.

Author: Sean Owen <[email protected]>

Closes #528 from srowen/SPARK-1488.2 and squashes the following commits:

62d592c [Sean Owen] More feature warnings in tests
4e2e94b [Sean Owen] 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

streaming/src/test/scala/org/apache/spark/streaming/NetworkReceiverSuite.scala

@@ -20,6 +20,7 @@ package org.apache.spark.streaming
 import java.nio.ByteBuffer
 
 import scala.collection.mutable.ArrayBuffer
+import scala.language.postfixOps
 
 import org.apache.spark.SparkConf
 import org.apache.spark.storage.{StorageLevel, StreamBlockId}

streaming/src/test/scala/org/apache/spark/streaming/StreamingListenerSuite.scala

@@ -20,6 +20,7 @@ package org.apache.spark.streaming
 import scala.collection.mutable.ArrayBuffer
 import scala.concurrent.Future
 import scala.concurrent.ExecutionContext.Implicits.global
+import scala.language.postfixOps
 
 import org.apache.spark.storage.StorageLevel
 import org.apache.spark.streaming.dstream.DStream