Do not include auth-token in pulled option digest

Do not include auth-token in pulled option digest

As change in auth-token is common on restart and does not
require tun-reopen, exclude it from the "pulled options digest"
calculation. Without this tun is always re-opened on SIGUSR1
if auth-token is in use which breaks persist-tun.

Github: Fixes OpenVPN/openvpn#200

v2: explcitly filter auth-token and auth-token-user

Signed-off-by: Selva Nair <selva.nair@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20221219140405.1221341-1-selva.nair@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg25768.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit f778f4f88e56851c0a68205e95110c021f3032b3)