message: Do not register endpoint if qps==0.
diff: @@ -109,6 +109,8 @@ impl RpcServer {
  config.max_body_bytes,
  ));
  + // QPS limit set to 0 disables the server.
  + if config.speculative_execution_qps_limit > 0 {
  let builder = utils::start_listening(&config.speculative_execution_address)?;
  tokio::spawn(speculative_exec_server::run(
  builder,
  @@ -117,6 +119,7 @@ impl RpcServer {
  config.speculative_execution_qps_limit,
  config.max_body_bytes,
  ));
  + }
  Ok(RpcServer {
  node_startup_instant,
  