Improve tokio task execution (#1181)

* Add logging on shutdown

* Replace tokio::spawn with handle.spawn

* Upgrade tokio

* Add a task executor

* Beacon chain tasks use task executor

* Validator client tasks use task executor

* Rename runtime_handle to executor

* Add duration histograms; minor fixes

* Cleanup

* Fix logs

* Fix tests

* Remove random file

* Get enr dependency instead of libp2p

* Address some review comments

* Libp2p takes a TaskExecutor

* Ugly fix libp2p tests

* Move TaskExecutor to own file

* Upgrade Dockerfile rust version

* Minor fixes

* Revert "Ugly fix libp2p tests"

This reverts commit 58d4bb690f.

* Pretty fix libp2p tests

* Add spawn_without_exit; change Counter to Gauge

* Tidy

* Move log from RuntimeContext to TaskExecutor

* Fix errors

* Replace histogram with int_gauge for async tasks

* Fix todo

* Fix memory leak in test by exiting all spawned tasks at the end

account_manager/Cargo.toml

@@ -31,5 +31,5 @@ eth2_wallet = { path = "../crypto/eth2_wallet" }
 eth2_wallet_manager = { path = "../common/eth2_wallet_manager" }
 rand = "0.7.2"
 validator_dir = { path = "../common/validator_dir", features = ["unencrypted_keys"] }
-tokio = {version = "0.2.20", features = ["full"]}
+tokio = { version = "0.2.21", features = ["full"] }
 eth2_keystore = { path = "../crypto/eth2_keystore" }

account_manager/src/validator/deposit.rs

@@ -83,7 +83,7 @@ pub fn cli_run<T: EthSpec>(
     matches: &ArgMatches<'_>,
     mut env: Environment<T>,
 ) -> Result<(), String> {
-    let log = env.core_context().log;
+    let log = env.core_context().log().clone();
 
     let data_dir = clap_utils::parse_path_with_default_in_home_dir(
         matches,