LANL: respond to Triad lawyers

LANL has been operated by a new outfit - Triad -
since 11/18 and want us to update the Open MPI
LICENSE file.

This commit hopefully pacifies Triad lawyers.

[skip ci]

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

Author: hppritcha

LICENSE

@@ -56,6 +56,7 @@ Copyright (c) 2013-2017 Research Organization for Information Science (RIST).
 Copyright (c) 2017-2018 Amazon.com, Inc. or its affiliates.  All Rights
                         reserved.
 Copyright (c) 2018      DataDirect Networks. All rights reserved.
+Copyright (c) 2018-2019 Triad National Security, LLC. All rights reserved.
 
 $COPYRIGHT$