Merge pull request #11784 from Igor Suhorukov

* gh-11784:
  Polish "Mark thread as interrupted after catching InterruptedException"
  Mark thread as interrupted after catching InterruptedException

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ImageBanner.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -253,6 +253,7 @@ public class ImageBanner implements Banner {
 			Thread.sleep(delay);
 		}
 		catch (InterruptedException ex) {
+			Thread.currentThread().interrupt();
 		}
 	}