pf: Introduce unhandled_af()HEADmain

For cases where code conditionally does something based on an address family
and later assumes one of the paths was taken.  This was initially just calls
to panic until guenther suggested a function to reduce the amount of strings
needed.

This reduces the amount of noise with static analysers and acts as a sanity
check.

ok guenther@ bluhm@

Obtained from:	OpenBSD, jsg <jsg@openbsd.org>, ba4138390b
Sponsored by:	Rubicon Communications, LLC ("Netgate")

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