Remove/replace deprecated OpenVPN options
Plus Target Version:
some changes from https://github.com/OpenVPN/openvpn/blob/release/2.4/Changes.rst:
--comp-lzo is deprecated in OpenVPN 2.4. Use --compress instead. --proto udp6/tcp6 in server mode will now try to always listen to both IPv4 and IPv6 on platforms that allow it. Use --bind ipv6only to explicitly listen only on IPv6. On Windows, when the --register-dns option is set, OpenVPN no longer restarts the dnscache service - this had unwanted side effects, and seems to be no longer necessary with currently supported Windows versions.
Need to check the full list