[Bug 290575] sys/net/if_tun_test:transient test fails intermittently in CI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290575

--- Comment #3 from Kyle Evans <kevans@freebsd.org> ---
I have a change prepared that moves removal of the tun device into a taskqueue,
I'm just working through the different bits we need to consider.  The test is
probably technically flakey after this if left untouched because we no longer
'guarantee' (it was never a written one) that the interface has been removed by
the time close(2) returns.  I'm not sure how much I care in practice: if you
want it to be transient anyways, you might as well take advantage of /dev/tun
cloning to avoid relying on an arbitrary unit number.

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