Add optional explicit ip config for smoke tests

src/test/smoketest/http-client.env.json

@@ -3,5 +3,10 @@
     "host": "localhost:8080",
     "username": "username",
     "password": "password"
+  },
+  "explicit-ip": {
+    "host": "0.0.0.0:8080",
+    "username": "username",
+    "password": "password"
   }
 }