8215571: jdb does not include jdk.* in the default class filter

Reviewed-by: alanb, cjplummer

src/jdk.jdi/share/classes/com/sun/tools/example/debug/tty/Env.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -108,7 +108,7 @@ static String getSourcePath() {
 
     static private List<String> excludes() {
         if (excludes == null) {
-            setExcludes("java.*, javax.*, sun.*, com.sun.*");
+            setExcludes("java.*, javax.*, sun.*, com.sun.*, jdk.*");
         }
         return excludes;
     }