node: Connect to preferred seeds — heartwood

Make sure we connect to and keep connected to preferred seeds.

     log::info!(target: "node", "Node ID is {}", signer.public_key());
     let config = options.config.unwrap_or_else(|| home.config());
     let config = profile::Config::load(&config)?.node;
     let mut config = profile::Config::load(&config)?;
     // Add the preferred seeds as persistent peers so that we reconnect to them automatically.
     config.node.connect.extend(config.preferred_seeds);
     let proxy = net::SocketAddr::new(net::Ipv4Addr::LOCALHOST.into(), 9050);
     let listen: Vec<std::net::SocketAddr> = if !options.listen.is_empty() {
         options.listen.clone()
     } else {
         config.listen.clone()
         config.node.listen.clone()
     };
     if let Err(e) = radicle::io::set_file_limit(config.limits.max_open_files as u64) {
     if let Err(e) = radicle::io::set_file_limit(config.node.limits.max_open_files as u64) {
         log::warn!(target: "node", "Unable to set process open file limit: {e}");
     }

         log::debug!(target: "node", "Removing existing control socket..");
         fs::remove_file(home.socket()).ok();
     }
     Runtime::init(home, config, listen, proxy, signals, signer)?.run()?;
     Runtime::init(home, config.node, listen, proxy, signals, signer)?.run()?;
     Ok(())
 }