Add MiMa excludes and fix a scalastyle error.

Author: JoshRosen

core/src/main/scala/org/apache/spark/FutureAction.scala

@@ -325,4 +325,4 @@ class JavaFutureActionWrapper[S, T](futureAction: FutureAction[S], converter: S
     }
   }
 
-}
+}

project/MimaExcludes.scala

@@ -51,6 +51,19 @@ object MimaExcludes {
             // MapStatus should be private[spark]
             ProblemFilters.exclude[IncompatibleTemplateDefProblem](
               "org.apache.spark.scheduler.MapStatus")
+          ) ++
+          Seq(
+            // Adding new methods to the JavaRDDLike trait:
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.api.java.JavaRDDLike.takeAsync"),
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.api.java.JavaRDDLike.foreachPartitionAsync"),
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.api.java.JavaRDDLike.countAsync"),
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.api.java.JavaRDDLike.foreachAsync"),
+            ProblemFilters.exclude[MissingMethodProblem](
+              "org.apache.spark.api.java.JavaRDDLike.collectAsync")
           )
 
         case v if v.startsWith("1.1") =>