Cleanup test utilities (#11725)

Co-authored-by: Carl <carl@solana.com>

runtime/src/bank_utils.rs

@@ -2,15 +2,12 @@ use crate::{
     bank::Bank,
     genesis_utils::{self, GenesisConfigInfo, ValidatorVoteKeypairs},
 };
-use solana_sdk::{
-    pubkey::Pubkey,
-    signature::{Keypair, Signer},
-};
+use solana_sdk::{pubkey::Pubkey, signature::Signer};
 
 pub fn setup_bank_and_vote_pubkeys(num_vote_accounts: usize, stake: u64) -> (Bank, Vec<Pubkey>) {
     // Create some voters at genesis
     let validator_voting_keypairs: Vec<_> = (0..num_vote_accounts)
-        .map(|_| ValidatorVoteKeypairs::new(Keypair::new(), Keypair::new(), Keypair::new()))
+        .map(|_| ValidatorVoteKeypairs::new_rand())
         .collect();
 
     let vote_pubkeys: Vec<_> = validator_voting_keypairs
@@ -21,7 +18,7 @@ pub fn setup_bank_and_vote_pubkeys(num_vote_accounts: usize, stake: u64) -> (Ban
         genesis_utils::create_genesis_config_with_vote_accounts(
             10_000,
             &validator_voting_keypairs,
-            stake,
+            vec![stake; validator_voting_keypairs.len()],
         );
     let bank = Bank::new(&genesis_config);
     (bank, vote_pubkeys)