Restore "openvpn@.service" from packaging of openvpn 2.3.6, so we can
start the sysmocom vpn the same way as currently described in the
manuals.
Previous patch 8439e71a99 already
attempted to do this, but only brought back "openvpn.service" and not
"openvpn@.service".
Fixes: 8439e71a ("openvpn: bring back openvpn.service file")
Related: SYS#6303
Change-Id: I28a7f491d74690409f815555743679c69e31b518
Restore the openvpn.service file from packaging of openvpn 2.3.6, so we
can still start it the same way (as currently described in manuals).
Related: SYS#6303
Change-Id: I2cf96bc1ecca79ae98be1181fbd3c15edad15ca8
Our openvpn server has meanwhile been migrated to 2.5.x, and
establishing backwards compatibility with 2.3.x means we have to
disable ciphers + tls versions that are no longer considered secure.
Related: SYS#6303