12370 mdb tests should be packaged

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  # Copyright 2014 Gary Mills
  #
  # Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright 2014 Garrett D'Amore <garrett@damore.org>
+ # Copyright 2020 Joyent, Inc.
  #
  #
  # open-tree exception list
  #
  # See README.exception_lists for details
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  #
  # ld tests which are not currently delivered
  #
  ./usr/src/cmd/sgs/test
- ./usr/src/cmd/mdb/test
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