credit_only credits forwarding (#6509)

* credit_only_credits_forwarding

* whack transfer_now()

* fixup

* bench should retry the airdrop TX

* fixup

* try to make bench-exchange a bit more robust, informative

programs/bpf/tests/programs.rs

@@ -117,10 +117,8 @@ mod bpf {
                 } = create_genesis_block(50);
                 let bank = Arc::new(Bank::new(&genesis_block));
                 // Create bank with specific slot, used by solana_bpf_rust_sysvar test
-                dbg!(bank.epoch());
                 let bank =
                     Bank::new_from_parent(&bank, &Pubkey::default(), DEFAULT_SLOTS_PER_EPOCH + 1);
-                dbg!(bank.epoch());
                 let bank_client = BankClient::new(bank);
 
                 // Call user program

programs/storage_program/tests/storage_processor.rs

@@ -469,7 +469,7 @@ fn init_storage_accounts(
     archiver_accounts_to_create: &[&Pubkey],
     lamports: u64,
 ) {
-    let mut ixs: Vec<_> = vec![system_instruction::transfer_now(&mint.pubkey(), owner, 1)];
+    let mut ixs: Vec<_> = vec![system_instruction::transfer(&mint.pubkey(), owner, 1)];
     ixs.append(
         &mut validator_accounts_to_create
             .into_iter()