fixup! rename to pool, more tests

ledger/src/entry.rs

@@ -4,7 +4,7 @@
 //! represents an approximate amount of time since the last Entry was created.
 use crate::poh::Poh;
 use log::*;
-use rayoff::rayoff::Pool;
+use rayoff::pool::Pool;
 use serde::{Deserialize, Serialize};
 use solana_measure::measure::Measure;
 use solana_merkle_tree::MerkleTree;

ledger/src/sigverify_shreds.rs

@@ -1,7 +1,7 @@
 #![allow(clippy::implicit_hasher)]
 use crate::shred::ShredType;
 use ed25519_dalek::{Keypair, PublicKey, SecretKey};
-use rayoff::rayoff::Pool;
+use rayoff::pool::Pool;
 use sha2::{Digest, Sha512};
 use solana_metrics::inc_new_counter_debug;
 use itertools::Itertools;