8010134: A finalizer in sun.security.pkcs11.wrapper.PKCS11 perhaps should be protected

Summary: Change the finalize method of PKCS11 class to be protected.
Reviewed-by: xuelei

src/share/classes/sun/security/pkcs11/wrapper/PKCS11.java

@@ -1528,7 +1528,7 @@ public class PKCS11 {
      *
      * @exception Throwable If finalization fails.
      */
-    public void finalize() throws Throwable {
+    protected void finalize() throws Throwable {
         disconnect();
     }