pesto: Run static checkers on pesto sources

Update the Makefile to run both clang-tidy and cppcheck on pesto as well
as on passt and passt-repair.  This requires a couple of secondary
corrections:
  * pesto.c had an inline suppression that is no longer correct now that
    the protocol version has been bumped to 1.  Remove it.
  * We were globally suppressing the unusedStructMember because it
    hit many false positives on both passt and passt-repair.  It doesn't
    in pesto, meaning it instead creates an unusedSuppression warning.
    Apply the suppression as a flag override for passt and passt-repair,
    instead of globally.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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