Rename KeypairUtil to Signer (#8360)

automerge

core/tests/bank_forks.rs

@@ -23,7 +23,7 @@ mod tests {
         clock::Slot,
         hash::hashv,
         pubkey::Pubkey,
-        signature::{Keypair, KeypairUtil},
+        signature::{Keypair, Signer},
         system_transaction,
     };
     use std::sync::RwLock;

core/tests/client.rs

@@ -7,7 +7,7 @@ use solana_core::{
     validator::new_validator_for_tests,
 };
 use solana_sdk::{
-    commitment_config::CommitmentConfig, pubkey::Pubkey, rpc_port, signature::KeypairUtil,
+    commitment_config::CommitmentConfig, pubkey::Pubkey, rpc_port, signature::Signer,
     system_transaction,
 };
 use std::{

core/tests/gossip.rs

@@ -6,7 +6,7 @@ use solana_core::cluster_info::{ClusterInfo, Node};
 use solana_core::gossip_service::GossipService;
 
 use solana_core::packet::Packet;
-use solana_sdk::signature::{Keypair, KeypairUtil};
+use solana_sdk::signature::{Keypair, Signer};
 use solana_sdk::timing::timestamp;
 use std::net::UdpSocket;
 use std::sync::atomic::{AtomicBool, Ordering};

core/tests/storage_stage.rs

@@ -15,7 +15,7 @@ mod tests {
     use solana_sdk::hash::Hash;
     use solana_sdk::message::Message;
     use solana_sdk::pubkey::Pubkey;
-    use solana_sdk::signature::{Keypair, KeypairUtil};
+    use solana_sdk::signature::{Keypair, Signer};
     use solana_sdk::transaction::Transaction;
     use solana_storage_program::storage_instruction;
     use solana_storage_program::storage_instruction::StorageAccountType;