grandpa: remove deprecated afg log target (#13064)

* grandpa: remove deprecated afg log target

* grandpa: define log targets in primitives

substrate/client/finality-grandpa/src/lib.rs

@@ -76,6 +76,9 @@ use sp_application_crypto::AppKey;
 use sp_blockchain::{Error as ClientError, HeaderBackend, HeaderMetadata, Result as ClientResult};
 use sp_consensus::SelectChain;
 use sp_core::crypto::ByteArray;
+use sp_finality_grandpa::{
+	AuthorityList, AuthoritySignature, SetId, CLIENT_LOG_TARGET as LOG_TARGET,
+};
 use sp_keystore::{SyncCryptoStore, SyncCryptoStorePtr};
 use sp_runtime::{
 	generic::BlockId,
@@ -93,8 +96,6 @@ use std::{
 	time::Duration,
 };
 
-const LOG_TARGET: &str = "grandpa";
-
 // utility logging macro that takes as first argument a conditional to
 // decide whether to log under debug or info level (useful to restrict
 // logging under initial sync).
@@ -142,7 +143,6 @@ pub use voting_rule::{
 use aux_schema::PersistentData;
 use communication::{Network as NetworkT, NetworkBridge};
 use environment::{Environment, VoterSetState};
-use sp_finality_grandpa::{AuthorityList, AuthoritySignature, SetId};
 use until_imported::UntilGlobalMessageBlocksImported;
 
 // Re-export these two because it's just so damn convenient.