8266881: Enable debug log for SSLEngineExplorerMatchedSNI.java

Backport-of: 2667024

Author: GoeLin

test/jdk/javax/net/ssl/ServerName/SSLEngineExplorerMatchedSNI.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -71,7 +71,7 @@ public class SSLEngineExplorerMatchedSNI extends SSLEngineService {
     /*
      * Turn on SSL debugging?
      */
-    static boolean debug = false;
+    static boolean debug = true;
 
     /*
      * Define the server side of the test.