Upgrade tokio to 1.22.0 and replace async-std with tokio (#12646)

* Replace deprecated libp2p feature specs with correct ones

* Bump tokio to 1.21.2

* Replace async-std libp2p primitives with tokio ones

* minor: rustfmt

* Fix TestNet to run initialization in the tokio context

* Convert telemetry test from async-std to tokio

* Convert notifications tests from async-std to tokio

* Convert chain sync tests from async-std to tokio

* Ditch async-std completely

* Make executor mandatory

* Bump tokio to 1.22.0

* minor: rustfmt

* Explicitly use tokio runtime in tests

* Move more tests to explicit tokio runtime

* Explicitly set multithreaded runtime in tokio test

* minor: rustfmt

* minor: fix comment

* Replace async-std with tokio in MMR tests

substrate/bin/node/cli/tests/websocket_server.rs

@@ -16,11 +16,12 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-use async_std::net::{TcpListener, TcpStream};
 use core::pin::Pin;
 use futures::prelude::*;
 use soketto::handshake::{server::Response, Server};
 use std::{io, net::SocketAddr};
+use tokio::net::{TcpListener, TcpStream};
+use tokio_util::compat::{Compat, TokioAsyncReadCompatExt};
 
 /// Configuration for a [`WsServer`].
 pub struct Config {
@@ -71,8 +72,12 @@ pub struct WsServer {
 	negotiating: stream::FuturesUnordered<
 		Pin<
 			Box<
-				dyn Future<Output = Result<Server<'static, TcpStream>, Box<dyn std::error::Error>>>
-					+ Send,
+				dyn Future<
+						Output = Result<
+							Server<'static, Compat<TcpStream>>,
+							Box<dyn std::error::Error>,
+						>,
+					> + Send,
 			>,
 		>,
 	>,
@@ -120,7 +125,7 @@ impl WsServer {
 		let pending_incoming = self.pending_incoming.take().expect("no pending socket");
 
 		self.negotiating.push(Box::pin(async move {
-			let mut server = Server::new(pending_incoming);
+			let mut server = Server::new(pending_incoming.compat());
 
 			let websocket_key = match server.receive_request().await {
 				Ok(req) => req.key(),