8264 want support for promoting datasets in libzfs_core

*** 18,27 ****
--- 18,28 ----
  #
  # CDDL HEADER END
  #
  # Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright (c) 2012, 2014 by Delphix. All rights reserved.
+ # Copyright 2017 RackTop Systems.
  #
  # MAPFILE HEADER START
  #
  # WARNING:  STOP NOW.  DO NOT MODIFY THIS FILE.
  # Object versioning must comply with the rules detailed in
*** 41,50 ****
--- 42,52 ----
  
          libzfs_core_fini;
          libzfs_core_init;
          lzc_bookmark;
          lzc_clone;
+         lzc_promote;
          lzc_create;
          lzc_destroy_bookmarks;
          lzc_destroy_snaps;
          lzc_exists;
          lzc_get_bookmarks;