RFR: 8174837: Add "since=9" to deprecated ContentSigner and ContentSignerParameters classes

[Sean Mullan]

Could I get a quick code review for this simple fix for 
https://bugs.openjdk.java.net/browse/JDK-8174837?:

diff --git 
a/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSigner.java 
b/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSigner.java
--- a/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSigner.java
+++ b/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSigner.java
@@ -1,5 +1,5 @@
  /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2017 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
@@ -38,7 +38,7 @@
   * @deprecated This class has been deprecated.
   */

- at Deprecated
+ at Deprecated(since="9")
  public abstract class ContentSigner {

      /**
diff --git 
a/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSignerParameters.java 
b/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSignerParameters.java
--- 
a/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSignerParameters.java
+++ 
b/src/jdk.jartool/share/classes/com/sun/jarsigner/ContentSignerParameters.java
@@ -1,5 +1,5 @@
  /*
- * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights 
reserved.
+ * Copyright (c) 2003, 2017, 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
@@ -36,7 +36,7 @@
   * @author Vincent Ryan
   * @deprecated This class has been deprecated.
   */
- at Deprecated
+ at Deprecated(since="9")
  public interface ContentSignerParameters {