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

testing/tests/tnc/tnccs-20-fail-resp/hosts/carol/etc/strongswan.conf

@@ -0,0 +1,15 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+charon {
+  load = aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac stroke kernel-netlink socket-default eap-identity eap-md5 eap-ttls eap-tnc tnc-tnccs tnc-imc tnccs-20 updown
+
+  multiple_authentication = no
+}
+
+libimcv {
+  plugins {
+    imc-test {
+      command = allow
+    }
+  }
+}