Deprecated StringUtils.mergeStringArrays

(cherry picked from commit 0f74052)

spring-core/src/test/java/org/springframework/util/StringUtilsTests.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.
@@ -443,6 +443,7 @@ public class StringUtilsTests {
 	}
 
 	@Test
+	@Deprecated
 	public void testMergeStringArrays() {
 		String[] input1 = new String[] {"myString2"};
 		String[] input2 = new String[] {"myString1", "myString2"};