Ignore auth failures during WPS

During WPS, EAP failure occurs many times due to searching
external registrar. EAP failure can also occur after WPS-success.
WPS failures are handled through seperate events, ignore auth failures.

Change-Id: I6a051398d306250510536d157bf812b5a434c84b
Signed-off-by: Irfan Sheriff <isheriff@google.com>
Signed-off-by: Yoshihiko Ikenaga <yoshihiko.ikenaga@jp.sony.com>