Update to tokio 1.1 (#2172)

## Issue Addressed

resolves #2129
resolves #2099 
addresses some of #1712
unblocks #2076
unblocks #2153 

## Proposed Changes

- Updates all the dependencies mentioned in #2129, except for web3. They haven't merged their tokio 1.0 update because they are waiting on some dependencies of their own. Since we only use web3 in tests, I think updating it in a separate issue is fine. If they are able to merge soon though, I can update in this PR. 

- Updates `tokio_util` to 0.6.2 and `bytes` to 1.0.1.

- We haven't made a discv5 release since merging tokio 1.0 updates so I'm using a commit rather than release atm. **Edit:** I think we should merge an update of `tokio_util` to 0.6.2 into discv5 before this release because it has panic fixes in `DelayQueue`  --> PR in discv5:  https://github.com/sigp/discv5/pull/58

## Additional Info

tokio 1.0 changes that required some changes in lighthouse:

- `interval.next().await.is_some()` -> `interval.tick().await`
- `sleep` future is now `!Unpin` -> https://github.com/tokio-rs/tokio/issues/3028
- `try_recv` has been temporarily removed from `mpsc` -> https://github.com/tokio-rs/tokio/issues/3350
- stream features have moved to `tokio-stream` and `broadcast::Receiver::into_stream()` has been temporarily removed -> `https://github.com/tokio-rs/tokio/issues/2870
- I've copied over the `BroadcastStream` wrapper from this PR, but can update to use `tokio-stream` once it's merged https://github.com/tokio-rs/tokio/pull/3384

Co-authored-by: realbigsean <seananderson33@gmail.com>

lcli/Cargo.toml

@@ -27,7 +27,7 @@ dirs = "3.0.1"
 genesis = { path = "../beacon_node/genesis" }
 deposit_contract = { path = "../common/deposit_contract" }
 tree_hash = "0.1.1"
-tokio = { version = "0.3.2", features = ["full"] }
+tokio = { version = "1.1.0", features = ["full"] }
 clap_utils = { path = "../common/clap_utils" }
 eth2_libp2p = { path = "../beacon_node/eth2_libp2p" }
 validator_dir = { path = "../common/validator_dir", features = ["insecure_keys"] }
@@ -37,4 +37,3 @@ lighthouse_version = { path = "../common/lighthouse_version" }
 directory = { path = "../common/directory" }
 account_utils = { path = "../common/account_utils" }
 eth2_wallet = { path = "../crypto/eth2_wallet" }
-tokio-compat-02 = "0.1"

lcli/src/eth1_genesis.rs

@@ -6,7 +6,6 @@ use ssz::Encode;
 use std::cmp::max;
 use std::path::PathBuf;
 use std::time::Duration;
-use tokio_compat_02::FutureExt;
 use types::EthSpec;
 
 /// Interval between polling the eth1 node for genesis information.
@@ -62,22 +61,19 @@ pub fn run<T: EthSpec>(mut env: Environment<T>, matches: &ArgMatches<'_>) -> Res
     let genesis_service =
         Eth1GenesisService::new(config, env.core_context().log().clone(), spec.clone());
 
-    env.runtime().block_on(
-        async {
-            let _ = genesis_service
-                .wait_for_genesis_state::<T>(ETH1_GENESIS_UPDATE_INTERVAL, spec)
-                .await
-                .map(move |genesis_state| {
-                    eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
-                    eth2_network_config.force_write_to_file(testnet_dir)
-                })
-                .map_err(|e| format!("Failed to find genesis: {}", e))?;
+    env.runtime().block_on(async {
+        let _ = genesis_service
+            .wait_for_genesis_state::<T>(ETH1_GENESIS_UPDATE_INTERVAL, spec)
+            .await
+            .map(move |genesis_state| {
+                eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
+                eth2_network_config.force_write_to_file(testnet_dir)
+            })
+            .map_err(|e| format!("Failed to find genesis: {}", e))?;
 
-            info!("Starting service to produce genesis BeaconState from eth1");
-            info!("Connecting to eth1 http endpoints: {:?}", endpoints);
+        info!("Starting service to produce genesis BeaconState from eth1");
+        info!("Connecting to eth1 http endpoints: {:?}", endpoints);
 
-            Ok(())
-        }
-        .compat(),
-    )
+        Ok(())
+    })
 }