Sending authentication-requests to multiple radius-servers

[Arran Cudbard-Bell]

> You could also use rlm_replicate to duplicate the packet, but there's currently no way of checking the aliveness of a realm at runtime, so you'd end up sending duplicate requests to whatever the primary OTP server was.

and that wouldn't help if you were actually wanting to authenticate the user instead of just performing some kind of synchronisation between the OTP servers.

-Arran