testing: Migrated ikev2 scenarios to new default plugins

testing/tests/ikev2/dpd-trap/hosts/carol/etc/swanctl/swanctl.conf

@@ -16,12 +16,13 @@ connections {
       children {
          home {
             remote_ts = 10.1.0.0/16
-            esp_proposals =aes128gcm16-x25519
+            esp_proposals = aes128gcm16-x25519
             dpd_action = trap
          }
       }
       version = 2
       mobike = no
+      proposals = aes128-sha256-x25519
       dpd_delay = 10
    }
 }