NEX-19401 update copyright year to 2019
Reviewed by: Rick McNeal <rick.mcneal@nexenta.com>
Reviewed by: Joyce McIntosh <joyce.mcintosh@nexenta.com>

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  # source.  A copy of the CDDL is also available via the Internet at
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! # Copyright 2018 <contributor>
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  # source.  A copy of the CDDL is also available via the Internet at
  # http://www.illumos.org/license/CDDL.
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! # Copyright 2019 Nexenta Systems, Inc.
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