options: warn and ignore --reneg-bytes/pkts when DCO is enabled

options: warn and ignore --reneg-bytes/pkts when DCO is enabled

Thresholds specified by --reneg-bytes and --reneg-pkts cannot be
enforced when DCO is enabled, as it only provides global statistics.

Rather than adding complexity to support these options, ignore them when
DCO is enabled. Print a warning to inform users and update the manpage
accordingly.

Change-Id: I7b718a14b81e3759398e7a52fe151102494cc821
Signed-off-by: Ralf Lici <ralf@mandelbit.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1280
Message-Id: <20251017191612.15642-1-gert@greenie.muc.de>
URL: https://sourceforge.net/p/openvpn/mailman/message/59248122/
Signed-off-by: Gert Doering <gert@greenie.muc.de>