Use tracing-based subscriber logging (#6825)

* init_logger: switch from log-based to tracing-based and add compatibility layer

* Move tracing profiling subscriber related config realization

* sp-tracing: change profiling to be a layer instead of a subscriber

* Enable profiling layer in cli

* Change all test env_logger init to sp_tracing::try_init_simple

* Remove all local env_logger dependency

* Add missing tracing-subscriber dependency

* frame-sudo: fix tests

* frame-support: fix tests

* Fix frame/pallet and executor tests

* Fix the remaining tests

* Use subscriber's try_init as recommended by @davidbarsky

* Be explict that the tracing-log feature is needed

* Set subscriber writer to stderr

* Shorter line width

* Update cargo lock tracing version

* Fix sc_tracing crate compile

* Fix sc_authority_discovery crate test

* unremove default-features

* Leave enabled to default true

* Warn if global default cannot be set

* Fix unused import

* Remove unused PROXY_TARGET

* Change all reference from rc5 to rc6

* Change all reference of rc2 to rc6

* Fix styling

* Fix typo

* make logger init error'ing

* re-fixing the test issue

Co-authored-by: Benjamin Kampmann <ben@parity.io>

substrate/client/service/src/builder.rs

@@ -36,7 +36,7 @@ use sp_consensus::{
 use futures::{FutureExt, StreamExt, future::ready, channel::oneshot};
 use jsonrpc_pubsub::manager::SubscriptionManager;
 use sc_keystore::Store as Keystore;
-use log::{info, warn, error};
+use log::{info, warn};
 use sc_network::config::{Role, FinalityProofProvider, OnDemand, BoxFinalityProofRequestBuilder};
 use sc_network::NetworkService;
 use parking_lot::RwLock;
@@ -572,17 +572,6 @@ pub fn spawn_tasks<TBl, TBackend, TExPool, TRpc, TCl>(
 		))
 	});
 
-	// Instrumentation
-	if let Some(tracing_targets) = config.tracing_targets.as_ref() {
-		let subscriber = sc_tracing::ProfilingSubscriber::new(
-			config.tracing_receiver, tracing_targets
-		);
-		match tracing::subscriber::set_global_default(subscriber) {
-			Ok(_) => (),
-			Err(e) => error!(target: "tracing", "Unable to set global default subscriber {}", e),
-		}
-	}
-
 	// Spawn informant task
 	spawn_handle.spawn("informant", sc_informant::build(
 		client.clone(),