turris-cagen: add pregenerated dhparam
This allows easier and faster setup of OpenVPN. It is just simply possible to reuse pregenerated dhparam.
The dhparam file was generated using command: openssl dhparam -out dhparam.pem 4096
Required for turris/foris-controller/foris-controller-openvpn-module#23 (closed)
Tied to turris/foris-controller/foris-controller-openvpn-module!8 (merged)
Edited by Vojtech Myslivec