NEX-3974 Remove timing issues so the robot can run consistently
Reviewed by: Steve Peng <steve.peng@nexenta.com>
Reviewed by: Josef Sipek <josef.sipek@nexenta.com>
Reviewed by: Alek Pinchuk <alek.pinchuk@nexenta.com>

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  # Use is subject to license terms.
  #
  
  #
  # Copyright (c) 2012, 2017 by Delphix. All rights reserved.
+ # Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
  #
  
  . $STF_SUITE/include/libtest.shlib
  . $STF_SUITE/tests/functional/cli_root/zpool_upgrade/zpool_upgrade.kshlib