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

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

@@ -0,0 +1,12 @@
+moon::iptables-restore < /etc/iptables.rules
+carol::iptables-restore < /etc/iptables.rules
+dave::iptables-restore < /etc/iptables.rules
+moon::cat /etc/tnc_config
+carol::cat /etc/tnc_config
+dave::cat /etc/tnc_config
+moon::ipsec start
+carol::ipsec start 
+dave::ipsec start
+carol::sleep 1
+carol::ipsec up home
+dave::ipsec up home