use internal host venus as dns2

testing/tests/ikev2/config-payload/hosts/moon/etc/strongswan.conf

@@ -3,5 +3,5 @@
 charon {
   load = curl aes des sha1 sha2 md5 gmp random x509 pubkey hmac xcbc stroke kernel-netlink updown
   dns1 = PH_IP_WINNETOU
-  dns2 = PH_IP_BOB
+  dns2 = PH_IP_VENUS
 }