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/client/beefy/src/aux_schema.rs

@@ -77,6 +77,7 @@ pub(crate) mod tests {
 	use super::*;
 	use crate::tests::BeefyTestNet;
 	use sc_network_test::TestNetFactory;
+	use tokio::runtime::Runtime;
 
 	// also used in tests.rs
 	pub fn verify_persisted_version<B: BlockT, BE: Backend<B>>(backend: &BE) -> bool {
@@ -86,7 +87,8 @@ pub(crate) mod tests {
 
 	#[test]
 	fn should_load_persistent_sanity_checks() {
-		let mut net = BeefyTestNet::new(1);
+		let runtime = Runtime::new().unwrap();
+		let mut net = BeefyTestNet::new(runtime.handle().clone(), 1);
 		let backend = net.peer(0).client().as_backend();
 
 		// version not available in db -> None