message: [config] Add default to network config enable_mdns.
diff: @@ -87,7 +87,9 @@ impl Default for NetworkRpcQuotaConfiguration {
  pub struct NetworkConfig {
  // The address that this node is listening on for new connections.
  pub listen: Multiaddr,
  + #[serde(default)]
  pub seeds: Vec<MultiaddrWithPeerId>,
  + #[serde(default)]
  pub enable_mdns: bool,
  //TODO skip this field, do not persistence this flag to config. this change will break network config.
  pub disable_seed: bool,
  