[SPARK-6453][Mesos] Some Mesos*Suite have a different package with their classes

- Moved Suites from o.a.s.s.mesos to o.a.s.s.cluster.mesos

Author: Jongyoul Lee <jongyoul@gmail.com>

Closes #5126 from jongyoul/SPARK-6453 and squashes the following commits:

4f24a3e [Jongyoul Lee] [SPARK-6453][Mesos] Some Mesos*Suite have a different package with their classes - Fixed imports orders
8ab149d [Jongyoul Lee] [SPARK-6453][Mesos] Some Mesos*Suite have a different package with their classes - Moved Suites from o.a.s.s.mesos to o.a.s.s.cluster.mesos

core/src/test/scala/org/apache/spark/scheduler/mesos/MesosSchedulerBackendSuite.scala → core/src/test/scala/org/apache/spark/scheduler/cluster/mesos/MesosSchedulerBackendSuite.scala

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-package org.apache.spark.scheduler.mesos
+package org.apache.spark.scheduler.cluster.mesos
 
 import java.nio.ByteBuffer
 import java.util
@@ -24,21 +24,20 @@ import java.util.Collections
 import scala.collection.mutable
 import scala.collection.mutable.ArrayBuffer
 
-import org.apache.mesos.SchedulerDriver
-import org.apache.mesos.Protos._
 import org.apache.mesos.Protos.Value.Scalar
-import org.mockito.Mockito._
+import org.apache.mesos.Protos._
+import org.apache.mesos.SchedulerDriver
 import org.mockito.Matchers._
+import org.mockito.Mockito._
 import org.mockito.{ArgumentCaptor, Matchers}
 import org.scalatest.FunSuite
 import org.scalatest.mock.MockitoSugar
 
-import org.apache.spark.{LocalSparkContext, SparkConf, SparkContext}
 import org.apache.spark.executor.MesosExecutorBackend
+import org.apache.spark.scheduler.cluster.ExecutorInfo
 import org.apache.spark.scheduler.{LiveListenerBus, SparkListenerExecutorAdded,
   TaskDescription, TaskSchedulerImpl, WorkerOffer}
-import org.apache.spark.scheduler.cluster.ExecutorInfo
-import org.apache.spark.scheduler.cluster.mesos.{MesosSchedulerBackend, MemoryUtils}
+import org.apache.spark.{LocalSparkContext, SparkConf, SparkContext}
 
 class MesosSchedulerBackendSuite extends FunSuite with LocalSparkContext with MockitoSugar {
 

core/src/test/scala/org/apache/spark/scheduler/mesos/MesosTaskLaunchDataSuite.scala → core/src/test/scala/org/apache/spark/scheduler/cluster/mesos/MesosTaskLaunchDataSuite.scala

@@ -15,14 +15,12 @@
  * limitations under the License.
  */
 
-package org.apache.spark.scheduler.mesos
+package org.apache.spark.scheduler.cluster.mesos
 
 import java.nio.ByteBuffer
 
 import org.scalatest.FunSuite
 
-import org.apache.spark.scheduler.cluster.mesos.MesosTaskLaunchData
-
 class MesosTaskLaunchDataSuite extends FunSuite {
   test("serialize and deserialize data must be same") {
     val serializedTask = ByteBuffer.allocate(40)