testing: Migrated ikev2 scenarios to new default plugins

testing/tests/ikev2/two-certs/hosts/moon/etc/swanctl/swanctl.conf

@@ -15,11 +15,14 @@ connections {
       children {
          alice {
             local_ts  = 10.1.0.10/32
+            esp_proposals = aes128gcm16-modp3072
          }
          venus {
             local_ts  = 10.1.0.20/32
+            esp_proposals = aes128gcm16-modp3072
          }
       }
       version = 2
+      proposals = aes128-sha256-modp3072
    }
 }