Fix more scalastyle

Author: mccheah

resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/KubernetesClusterSchedulerBackend.scala

@@ -21,12 +21,12 @@ import java.net.InetAddress
 import java.util.concurrent.{ConcurrentHashMap, ExecutorService, ScheduledExecutorService, TimeUnit}
 import java.util.concurrent.atomic.{AtomicInteger, AtomicLong, AtomicReference}
 
-import scala.collection.JavaConverters._
-import scala.collection.mutable
-import scala.concurrent.{ExecutionContext, Future}
 import io.fabric8.kubernetes.api.model._
 import io.fabric8.kubernetes.client.{KubernetesClient, KubernetesClientException, Watcher}
 import io.fabric8.kubernetes.client.Watcher.Action
+import scala.collection.JavaConverters._
+import scala.collection.mutable
+import scala.concurrent.{ExecutionContext, Future}
 
 import org.apache.spark.SparkException
 import org.apache.spark.deploy.k8s.config._