Clean up warnings in spring-core

spring-core/src/main/java/org/springframework/core/annotation/AnnotationUtils.java

@@ -126,6 +126,7 @@ public abstract class AnnotationUtils {
 	private static final Map<Class<?>, Set<Method>> annotatedBaseTypeCache =
 			new ConcurrentReferenceHashMap<>(256);
 
+	@SuppressWarnings("unused")
 	@Deprecated  // just here for older tool versions trying to reflectively clear the cache
 	private static final Map<Class<?>, ?> annotatedInterfaceCache = annotatedBaseTypeCache;
 

spring-core/src/main/java/org/springframework/util/concurrent/CompletableToListenableFutureAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,7 +21,6 @@ import java.util.concurrent.CompletionStage;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
-import java.util.function.BiConsumer;
 
 /**
  * Adapts a {@link CompletableFuture} or {@link CompletionStage} into a