Turn off VPN

[scotthaleen]

Now that ovpn doesn't start with the container. We should also have a stop vpn endpoint to optionally shutdown the vpn when something is finished using it

[scotthaleen]

Similar to
https://github.com/jataware/vpnrotate/blob/master/vpnrotate/src/vpnrotate/svchandler.py#L92

async def restartVPN():
    async with OVPN_LOCK:
        process = await asyncio.create_subprocess_exec("sv", "restart", "ovpn")
        rc = await process.wait()
        return rc == 0, rc

except sv stop ovpn

And then add the route + swagger to expose it