vnet tests: verify that we can load if_epair and if_bridge

We're going to start running many of the vnet tests in nested jails (so they
can run in parallel). That means the tests won't be able to lo

vnet tests: verify that we can load if_epair and if_bridge

We're going to start running many of the vnet tests in nested jails (so they
can run in parallel). That means the tests won't be able to load kernel modules,
which we commonly do for if_epair and if_bridge.

Just assume that all vnet tests need this, because so many of them do that we
don't want to manually annotate all of them.
This is essentially a no-op on non-nested tests.

Do the same for the python test framework.

While here also have pflog_init actually call pft_init. While having pflog
loaded implies we have pf too pft_init also checks for vimage support, and now
for if_epair.

Reviewed by: markj
MFC after: 1 month
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D46039

(cherry picked from commit ae8d58814089308028046ac80aeeb9cbb784bd0a)

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vnet tests: check for if_bridge.ko

A number of tests create a bridge, but did not check if if_bridge.ko is loaded.

We usually get away with that, because `ifconfig bridge create` autoloads the
modu

vnet tests: check for if_bridge.ko

A number of tests create a bridge, but did not check if if_bridge.ko is loaded.

We usually get away with that, because `ifconfig bridge create` autoloads the
module, but if we run the tests in a jail (e.g. because of kyua's upcoming
execenv.jail.params feature) we can't load the module and these tests can fail.

Check if the module is loaded, skip the test if it is not.

Reviewed by: markj
MFC after: 1 week
Event: Kitchener-Waterloo Hackathon 202406
Differential Revision: https://reviews.freebsd.org/D45487

(cherry picked from commit 480ad4055314efbfff7eedbb34272031d836ba89)

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