Fix up various imports

Author: tgravescs

core/src/main/scala/org/apache/spark/deploy/master/Master.scala

@@ -30,7 +30,7 @@ import akka.pattern.ask
 import akka.remote.{DisassociatedEvent, RemotingLifecycleEvent}
 import akka.serialization.SerializationExtension
 
-import org.apache.spark.{SecurityManager, SparkConf, Logging, SparkException}
+import org.apache.spark.{Logging, SecurityManager, SparkConf, SparkException}
 import org.apache.spark.deploy.{ApplicationDescription, DriverDescription, ExecutorState}
 import org.apache.spark.deploy.DeployMessages._
 import org.apache.spark.deploy.master.DriverState.DriverState

core/src/main/scala/org/apache/spark/metrics/MetricsSystem.scala

@@ -24,7 +24,7 @@ import scala.collection.mutable
 
 import com.codahale.metrics.{Metric, MetricFilter, MetricRegistry}
 
-import org.apache.spark.{SecurityManager, SparkConf, Logging}
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
 import org.apache.spark.metrics.sink.{MetricsServlet, Sink}
 import org.apache.spark.metrics.source.Source
 

core/src/main/scala/org/apache/spark/network/SenderTest.scala

@@ -18,7 +18,6 @@
 package org.apache.spark.network
 
 import java.nio.ByteBuffer
-import java.net.InetAddress
 import org.apache.spark.{SecurityManager, SparkConf}
 
 private[spark] object SenderTest {

core/src/main/scala/org/apache/spark/ui/JettyUtils.scala

@@ -33,9 +33,7 @@ import org.eclipse.jetty.server.handler.HandlerList
 import org.eclipse.jetty.servlet.{DefaultServlet, FilterHolder, ServletContextHandler, ServletHolder}
 import org.eclipse.jetty.util.thread.QueuedThreadPool
 
-import org.apache.spark.Logging
-import org.apache.spark.SecurityManager
-import org.apache.spark.SparkConf
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
 
 
 /** Utilities for launching a web server using Jetty's HTTP Server class */

core/src/main/scala/org/apache/spark/util/Utils.scala

@@ -18,7 +18,7 @@
 package org.apache.spark.util
 
 import java.io._
-import java.net.{InetAddress, Inet4Address, NetworkInterface, URI, URL}
+import java.net.{InetAddress, Inet4Address, NetworkInterface, URI, URL, URLConnection}
 import java.nio.ByteBuffer
 import java.util.{Locale, Random, UUID}
 import java.util.concurrent.{ConcurrentHashMap, Executors, ThreadPoolExecutor}