Fix port-share option with TLS-Crypt v2

Fix port-share option with TLS-Crypt v2

The port-share option assumed that all openvpn initial reset packets
are between 14 and 255 bytes long. This is not true for tls-crypt-v2.

Patch V2: use correct length for TLS-Crypt v2, use length variable
          non-tlscryptv2 test

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Steffan Karger <steffan.karger@foxcrypto.com>
Message-Id: <20201130123813.21388-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg21290.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>