pf tests: make pfsync:defer test more robust

Set the defer timeout to 2.5 seconds, and only make sure that there's at
least a second of delay between the pfsync packet and the ping packet.
The inten

pf tests: make pfsync:defer test more robust

Set the defer timeout to 2.5 seconds, and only make sure that there's at
least a second of delay between the pfsync packet and the ping packet.
The intent is to allow the test to pass even when there's considerable
jitter on the timing measurement (e.g. when the test runs in a VM, such
as during the CI tests).

Allow the test to run in CI.

Sponsored by: Rubicon Communications, LLC ("Netgate")

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netpfil tests: improve pfsync_defer.py

Return different exit code depending on which failure was encountered.
The pfsync test expect a very particular failure, not just any.

MFC after: 1 week
Spons

netpfil tests: improve pfsync_defer.py

Return different exit code depending on which failure was encountered.
The pfsync test expect a very particular failure, not just any.

MFC after: 1 week
Sponsored by: InnoGames GmbH
Differential Revision: https://reviews.freebsd.org/D38123

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pf tests: more thorough pfsync defer test

Add a somewhat more extensive pfsync defer mode test. Ensure that pfsync
actually delays the state creating packet until after it has sent the
pfsync update

pf tests: more thorough pfsync defer test

Add a somewhat more extensive pfsync defer mode test. Ensure that pfsync
actually delays the state creating packet until after it has sent the
pfsync update and given the peer time to create the state.

Ideally the test should validate the pfsync state update and generate an
ack message, but to keep the test simple we rely on the timeout of the
deferred packet instead.

MFC after: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D33245

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