Added tnc/tnccs-20-fail-init and tnc/tnccs-20-fail-resp scenarios

testing/tests/tnc/tnccs-20-fail-init/posttest.dat

@@ -0,0 +1,6 @@
+carol::ipsec stop
+dave::ipsec stop
+moon::ipsec stop
+moon::iptables-restore < /etc/iptables.flush
+carol::iptables-restore < /etc/iptables.flush
+dave::iptables-restore < /etc/iptables.flush