upgraded Test IMC/IMV pair to fully support multple IMC IDs

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

@@ -14,6 +14,7 @@ libimcv {
   plugins {
     imc-test {
       command = allow
+      additional_ids = 2
     }
   }
 }

testing/tests/tnc/tnccs-20/hosts/dave/etc/strongswan.conf

@@ -17,6 +17,7 @@ libimcv {
   plugins {
     imc-test {
       command = isolate
+      additional_ids = 1
     }
   }
 }