openvpn client certificate set expiry

>> Commit: Set client and server certificates validity to 10 years (#1235)

https://github.com/angristan/openvpn-install/commit/a189535563f1b48605115643585e036cd5631ac1

10 years is a bit long from #security perspective, isnt it? Especially for user certificates.

M2M I0T certificates need to be longer valid.

#iot #vpn