Putting OPIE to rest

From: Dag-Erling_Smørgrav <des_at_des.no>
Date: Thu, 15 Sep 2022 13:45:14 UTC
I will be removing OPIE from the main branch within the next few days.
It has long outlived its usefulness.  Anyone still using it should look
into OATH HOTP / TOTP instead (cf. security/pam_google_authenticator).

https://reviews.freebsd.org/D36592

DES
-- 
Dag-Erling Smørgrav - des@des.no