Removed mismerged Joyent copyright

*** 18,28 ****
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
-  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   * Copyright (c) 2013 by Delphix. All rights reserved.
   * Copyright (c) 2012, Joyent, Inc. All rights reserved.
   */
  /* Copyright (c) 1990 Mentat Inc. */
  
--- 18,27 ----