Logging EAP-TLS failures

[Norman Elton]

> > Am I headed in the right direction? Is there a way to catch the
> > certificate details in a linelog module after the certificate has been
> > found invalid?
>
>   Not really.

To help with troubleshooting, I'd like to be able to see why the
certificate validation failed.

I'm going to try Arran's suggestion to check the
Module-Failure-Message. I wasn't familiar with that one.

Thanks,

Norman