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2023-01-29T07:51:35.350198Z
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netpfil tests: improve sniffer.py

Multiple improvements to sniffer.py:

* Remove ambiguity of configuring recvif, it must be now explicitly specified.
* Don't catch exceptions around creating the sniffer, let it properly
  fail and display the whole stack trace.
* Count correct packets so that duplicates can be found.

MFC after:	1 week
Sponsored by:	InnoGames GmbH
Differential Revision:	https://reviews.freebsd.org/D38120

(cherry picked from commit a39dedeb31052ec74b0cd394d56f8d7cc8534645)

Git Hash:   e2be74cff37aa46695838bcede8eb4b7d32f31f2
Git Author: vegeta@tuxpowered.net
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