Fix: Allow test state machine users to override next state.
And fail the tls state machine gracefully while supporting negative test cases.

Change-Id: I4f5dcd6dfd81ec9e3e36d2929b3b10ae40acb851
diff --git a/src/test/utils/EapTLS.py b/src/test/utils/EapTLS.py
index 04c2918..cf8c673 100644
--- a/src/test/utils/EapTLS.py
+++ b/src/test/utils/EapTLS.py
@@ -161,6 +161,7 @@
     def tlsFail(self):
         ##Force a failure
         self.nextEvent = self.tlsEventTable.EVT_EAP_TLS_FINISHED
+        self.nextState = self.tlsStateTable.ST_EAP_TLS_FINISHED
         self.failTest = True
 
     def eapol_server_hello_cb(self, pkt):
@@ -372,7 +373,7 @@
             return r
 
     def _eapTlsFinished(self):
-
+        self.nextEvent = None
         def eapol_cb(pkt):
             log.info('Server authentication successfull')
 
@@ -388,4 +389,3 @@
                               lambda pkt: EAP in pkt and pkt[EAP].code == EAP.SUCCESS,
                               timeout = timeout)
         self.eapol_logoff()
-        self.nextEvent = None