test: NAT Traversal testing utils and tests

Author: joshuakarp

package-lock.json

@@ -10,6 +10,7 @@ in
       utils.node2nix
       grpc-tools
       grpcurl
+      iptables-legacy
     ];
     PKG_CACHE_PATH = utils.pkgCachePath;
     PKG_IGNORE_TAG = 1;