Upgrade to tokio 0.3 (#1839)

## Description

This PR updates Lighthouse to tokio 0.3. It includes a number of dependency updates and some structural changes as to how we create and spawn tasks.

This also brings with it a number of various improvements:

- Discv5 update
- Libp2p update
- Fix for recompilation issues
- Improved UPnP port mapping handling
- Futures dependency update
- Log downgrade to traces for rejecting peers when we've reached our max



Co-authored-by: blacktemplar <blacktemplar@a1.net>

testing/simulator/src/checks.rs

@@ -46,13 +46,13 @@ pub async fn verify_first_finalization<E: EthSpec>(
 /// Delays for `epochs`, plus half a slot extra.
 pub async fn epoch_delay(epochs: Epoch, slot_duration: Duration, slots_per_epoch: u64) {
     let duration = slot_duration * (epochs.as_u64() * slots_per_epoch) as u32 + slot_duration / 2;
-    tokio::time::delay_for(duration).await
+    tokio::time::sleep(duration).await
 }
 
 /// Delays for `slots`, plus half a slot extra.
 async fn slot_delay(slots: Slot, slot_duration: Duration) {
     let duration = slot_duration * slots.as_u64() as u32 + slot_duration / 2;
-    tokio::time::delay_for(duration).await;
+    tokio::time::sleep(duration).await;
 }
 
 /// Verifies that all beacon nodes in the given network have a head state that has a finalized

testing/simulator/src/eth1_sim.rs

@@ -197,6 +197,12 @@ pub fn run_eth1_sim(matches: &ArgMatches) -> Result<(), String> {
         Ok::<(), String>(())
     };
 
-    env.runtime().block_on(main_future).unwrap();
+    env.runtime()
+        .block_on(tokio_compat_02::FutureExt::compat(main_future))
+        .unwrap();
+
+    env.fire_signal();
+    env.shutdown_on_idle();
+
     Ok(())
 }

testing/simulator/src/no_eth1_sim.rs

@@ -8,7 +8,7 @@ use node_test_rig::{
 use rayon::prelude::*;
 use std::net::{IpAddr, Ipv4Addr};
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
-use tokio::time::{delay_until, Instant};
+use tokio::time::{sleep_until, Instant};
 use types::{Epoch, EthSpec, MainnetEthSpec};
 
 pub fn run_no_eth1_sim(matches: &ArgMatches) -> Result<(), String> {
@@ -111,7 +111,7 @@ pub fn run_no_eth1_sim(matches: &ArgMatches) -> Result<(), String> {
          * The processes that will run checks on the network as it runs.
          */
         let checks_fut = async {
-            delay_until(genesis_instant).await;
+            sleep_until(genesis_instant).await;
 
             let (finalization, block_prod) = futures::join!(
                 // Check that the chain finalizes at the first given opportunity.
@@ -156,6 +156,11 @@ pub fn run_no_eth1_sim(matches: &ArgMatches) -> Result<(), String> {
         Ok::<(), String>(())
     };
 
-    env.runtime().block_on(main_future).unwrap();
+    env.runtime()
+        .block_on(tokio_compat_02::FutureExt::compat(main_future))
+        .unwrap();
+
+    env.fire_signal();
+    env.shutdown_on_idle();
     Ok(())
 }