Rename KeypairUtil to Signer (#8360)

automerge

local-cluster/src/cluster_tests.rs

@@ -24,7 +24,7 @@ use solana_sdk::{
     hash::Hash,
     poh_config::PohConfig,
     pubkey::Pubkey,
-    signature::{Keypair, KeypairUtil, Signature},
+    signature::{Keypair, Signature, Signer},
     system_transaction,
     timing::duration_as_ms,
     transport::TransportError,

local-cluster/src/local_cluster.rs

@@ -20,7 +20,7 @@ use solana_sdk::{
     message::Message,
     poh_config::PohConfig,
     pubkey::Pubkey,
-    signature::{Keypair, KeypairUtil},
+    signature::{Keypair, Signer},
     system_transaction,
     transaction::Transaction,
 };

local-cluster/tests/archiver.rs

@@ -15,7 +15,7 @@ use solana_local_cluster::local_cluster::{ClusterConfig, LocalCluster};
 use solana_sdk::{
     commitment_config::CommitmentConfig,
     genesis_config::create_genesis_config,
-    signature::{Keypair, KeypairUtil},
+    signature::{Keypair, Signer},
 };
 use std::{
     fs::remove_dir_all,

local-cluster/tests/local_cluster.rs

@@ -23,7 +23,7 @@ use solana_sdk::{
     epoch_schedule::{EpochSchedule, MINIMUM_SLOTS_PER_EPOCH},
     genesis_config::OperatingMode,
     poh_config::PohConfig,
-    signature::{Keypair, KeypairUtil},
+    signature::{Keypair, Signer},
 };
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::{