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

testing/eth1_test_rig/Cargo.toml

@@ -5,8 +5,8 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
+tokio = { version = "0.2.21", features = ["time"] }
 web3 = "0.11.0"
-tokio = { version = "0.2.20", features = ["time"] }
 futures = { version = "0.3.5", features = ["compat"] }
 types = { path = "../../consensus/types"}
 serde_json = "1.0.52"

testing/simulator/Cargo.toml

@@ -12,7 +12,7 @@ types = { path = "../../consensus/types" }
 validator_client = { path = "../../validator_client" }
 parking_lot = "0.10.2"
 futures = "0.3.5"
-tokio = "0.2.20"
+tokio = "0.2.21"
 eth1_test_rig = { path = "../eth1_test_rig" }
 env_logger = "0.7.1"
 clap = "2.33.0"