Fix EAPOL/EAP reauthentication with external RADIUS server

Fix EAPOL/EAP reauthentication with external RADIUS server

The EAP server state machine will need to have special code in
getDecision() to avoid starting passthrough operations before having
completed Identity round in the beginning of reauthentication. This was
broken when moving into using the full authenticator state machine from
RFC 4137 in 0.6.x.