Warn that tls-auth with free form files is going to be removed from OpenVPN 2.4

Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <1417872129-31980-2-git-send-email-arne@rfc2549.org>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9309

Signed-off-by: Gert Doering <gert@greenie.muc.de>