Prepare riseup infra transition

Verifying that the following config gets parsed correctly, and cipher is used for data-cipher as well.

"openvpn_configuration": {
    "auth": "SHA1",
    "cipher": "AES-256-GCM:AES-128-CBC", 
    "tls-cipher": "TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384:DHE-RSA-AES128-SHA",
    ...
}