removed unused imports

Author: brkyvz

core/src/main/scala/org/apache/spark/deploy/RPackageUtils.scala

@@ -18,19 +18,18 @@
 package org.apache.spark.deploy
 
 import java.io._
-import java.net.URI
 import java.util.jar.JarFile
 import java.util.logging.Level
 import java.util.zip.{ZipEntry, ZipOutputStream}
 
+import scala.collection.JavaConversions._
+
 import com.google.common.io.{ByteStreams, Files}
 
 import org.apache.spark.{SparkException, Logging}
 import org.apache.spark.api.r.RUtils
 import org.apache.spark.util.{RedirectThread, Utils}
 
-import scala.collection.JavaConversions._
-
 private[deploy] object RPackageUtils extends Logging {
 
   /** The key in the MANIFEST.mf that we look for, in case a jar contains R code. */

core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala

@@ -365,7 +365,7 @@ class SparkSubmitSuite
   }
 
   test("correctly builds R packages included in a jar with --packages") {
-    // TODO: Building a package to $SPARK_HOME/R/lib is unavailable on Jenkins.
+    // TODO(SPARK-9603): Building a package to $SPARK_HOME/R/lib is unavailable on Jenkins.
     // It's hard to write the test in SparkR (because we can't create the repository dynamically)
     /*
     assume(RUtils.isRInstalled, "R isn't installed on this machine.")

yarn/src/test/scala/org/apache/spark/deploy/yarn/YarnClusterSuite.scala

@@ -22,9 +22,6 @@ import java.net.URL
 import java.util.Properties
 import java.util.concurrent.TimeUnit
 
-import org.apache.spark.deploy.IvyTestUtils
-import org.apache.spark.deploy.SparkSubmitUtils.MavenCoordinate
-
 import scala.collection.JavaConversions._
 import scala.collection.mutable