Add a test and small improvement for null PMD

v2 - review feedback and small improvement

Stephen Hemminger (2):
  test: add a test for null PMD
  net/null: revise info_get

 app/test/meson.build            |   1 +
 app/test/test_pmd_null.c        | 811 ++++++++++++++++++++++++++++++++
 drivers/net/null/rte_eth_null.c |  11 +-
 3 files changed, 816 insertions(+), 7 deletions(-)
 create mode 100644 app/test/test_pmd_null.c

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2.51.0