Clean up use to keep rust 1.43.0 from complaining (#9740)

core/src/crds_gossip_pull.rs

@@ -14,7 +14,6 @@ use crate::crds::Crds;
 use crate::crds_gossip::{get_stake, get_weight, CRDS_GOSSIP_DEFAULT_BLOOM_ITEMS};
 use crate::crds_gossip_error::CrdsGossipError;
 use crate::crds_value::{CrdsValue, CrdsValueLabel};
-use rand;
 use rand::distributions::{Distribution, WeightedIndex};
 use rand::Rng;
 use solana_runtime::bloom::Bloom;

core/src/poh_service.rs

@@ -1,10 +1,8 @@
 //! The `poh_service` module implements a service that records the passing of
 //! "ticks", a measure of time in the PoH stream
 use crate::poh_recorder::PohRecorder;
-use core_affinity;
 use solana_sdk::clock::DEFAULT_TICKS_PER_SLOT;
 use solana_sdk::poh_config::PohConfig;
-use solana_sys_tuner;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
 use std::thread::{self, sleep, Builder, JoinHandle};