message: fix copyright date, and remove inapplicable comment
diff: #!/usr/bin/env python3
  -# Copyright (c) 2015-2017 The Bitcoin Unlimited developers
  +# Copyright (c) 2018 The Bitcoin Unlimited developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  -# This is a template to make creating new QA tests easy.
  -# You can also use this template to quickly start and connect a few regtest nodes.
  -
  import time
  import sys
  if sys.version_info[0] < 3:
  