Reformat imports to a consistent style for imports

rustfmt.toml configuration:
  imports_granularity = "One"
  group_imports = "One"

core/benches/banking_stage.rs

@@ -3,41 +3,44 @@
 
 extern crate test;
 
-use crossbeam_channel::unbounded;
-use log::*;
-use rand::{thread_rng, Rng};
-use rayon::prelude::*;
-use solana_core::banking_stage::{BankingStage, BankingStageStats};
-use solana_core::qos_service::QosService;
-use solana_entry::entry::{next_hash, Entry};
-use solana_gossip::cluster_info::ClusterInfo;
-use solana_gossip::cluster_info::Node;
-use solana_ledger::blockstore_processor::process_entries_for_tests;
-use solana_ledger::genesis_utils::{create_genesis_config, GenesisConfigInfo};
-use solana_ledger::{blockstore::Blockstore, get_tmp_ledger_path};
-use solana_perf::packet::to_packets_chunked;
-use solana_perf::test_tx::test_tx;
-use solana_poh::poh_recorder::{create_test_recorder, WorkingBankEntry};
-use solana_runtime::bank::Bank;
-use solana_runtime::cost_model::CostModel;
-use solana_sdk::genesis_config::GenesisConfig;
-use solana_sdk::hash::Hash;
-use solana_sdk::message::Message;
-use solana_sdk::pubkey;
-use solana_sdk::signature::Keypair;
-use solana_sdk::signature::Signature;
-use solana_sdk::signature::Signer;
-use solana_sdk::system_instruction;
-use solana_sdk::system_transaction;
-use solana_sdk::timing::{duration_as_us, timestamp};
-use solana_sdk::transaction::{Transaction, VersionedTransaction};
-use solana_streamer::socket::SocketAddrSpace;
-use std::collections::VecDeque;
-use std::sync::atomic::Ordering;
-use std::sync::mpsc::Receiver;
-use std::sync::{Arc, RwLock};
-use std::time::{Duration, Instant};
-use test::Bencher;
+use {
+    crossbeam_channel::unbounded,
+    log::*,
+    rand::{thread_rng, Rng},
+    rayon::prelude::*,
+    solana_core::{
+        banking_stage::{BankingStage, BankingStageStats},
+        qos_service::QosService,
+    },
+    solana_entry::entry::{next_hash, Entry},
+    solana_gossip::cluster_info::{ClusterInfo, Node},
+    solana_ledger::{
+        blockstore::Blockstore,
+        blockstore_processor::process_entries_for_tests,
+        genesis_utils::{create_genesis_config, GenesisConfigInfo},
+        get_tmp_ledger_path,
+    },
+    solana_perf::{packet::to_packets_chunked, test_tx::test_tx},
+    solana_poh::poh_recorder::{create_test_recorder, WorkingBankEntry},
+    solana_runtime::{bank::Bank, cost_model::CostModel},
+    solana_sdk::{
+        genesis_config::GenesisConfig,
+        hash::Hash,
+        message::Message,
+        pubkey,
+        signature::{Keypair, Signature, Signer},
+        system_instruction, system_transaction,
+        timing::{duration_as_us, timestamp},
+        transaction::{Transaction, VersionedTransaction},
+    },
+    solana_streamer::socket::SocketAddrSpace,
+    std::{
+        collections::VecDeque,
+        sync::{atomic::Ordering, mpsc::Receiver, Arc, RwLock},
+        time::{Duration, Instant},
+    },
+    test::Bencher,
+};
 
 fn check_txs(receiver: &Arc<Receiver<WorkingBankEntry>>, ref_tx_count: usize) {
     let mut total = 0;

core/benches/consensus.rs

@@ -7,8 +7,7 @@ use {
     solana_core::{
         consensus::Tower, tower_storage::FileTowerStorage, vote_simulator::VoteSimulator,
     },
-    solana_runtime::bank::Bank,
-    solana_runtime::bank_forks::BankForks,
+    solana_runtime::{bank::Bank, bank_forks::BankForks},
     solana_sdk::{
         pubkey::Pubkey,
         signature::{Keypair, Signer},

core/benches/gen_keys.rs

@@ -2,8 +2,7 @@
 
 extern crate test;
 
-use solana_core::gen_keys::GenKeys;
-use test::Bencher;
+use {solana_core::gen_keys::GenKeys, test::Bencher};
 
 #[bench]
 fn bench_gen_keys(b: &mut Bencher) {

core/benches/shredder.rs

@@ -3,18 +3,19 @@
 
 extern crate test;
 
-use rand::seq::SliceRandom;
-use raptorq::{Decoder, Encoder};
-use solana_entry::entry::{create_ticks, Entry};
-use solana_ledger::shred::{
-    max_entries_per_n_shred, max_ticks_per_n_shreds, ProcessShredsStats, Shred, Shredder,
-    MAX_DATA_SHREDS_PER_FEC_BLOCK, SHRED_PAYLOAD_SIZE, SIZE_OF_CODING_SHRED_HEADERS,
-    SIZE_OF_DATA_SHRED_PAYLOAD,
+use {
+    rand::seq::SliceRandom,
+    raptorq::{Decoder, Encoder},
+    solana_entry::entry::{create_ticks, Entry},
+    solana_ledger::shred::{
+        max_entries_per_n_shred, max_ticks_per_n_shreds, ProcessShredsStats, Shred, Shredder,
+        MAX_DATA_SHREDS_PER_FEC_BLOCK, SHRED_PAYLOAD_SIZE, SIZE_OF_CODING_SHRED_HEADERS,
+        SIZE_OF_DATA_SHRED_PAYLOAD,
+    },
+    solana_perf::test_tx,
+    solana_sdk::{hash::Hash, signature::Keypair},
+    test::Bencher,
 };
-use solana_perf::test_tx;
-use solana_sdk::hash::Hash;
-use solana_sdk::signature::Keypair;
-use test::Bencher;
 
 fn make_test_entry(txs_per_entry: u64) -> Entry {
     Entry {

core/benches/sigverify_stage.rs

@@ -3,20 +3,24 @@
 extern crate solana_core;
 extern crate test;
 
-use crossbeam_channel::unbounded;
-use log::*;
-use rand::{thread_rng, Rng};
-use solana_core::sigverify::TransactionSigVerifier;
-use solana_core::sigverify_stage::SigVerifyStage;
-use solana_perf::packet::to_packets_chunked;
-use solana_perf::test_tx::test_tx;
-use solana_sdk::hash::Hash;
-use solana_sdk::signature::{Keypair, Signer};
-use solana_sdk::system_transaction;
-use solana_sdk::timing::duration_as_ms;
-use std::sync::mpsc::channel;
-use std::time::{Duration, Instant};
-use test::Bencher;
+use {
+    crossbeam_channel::unbounded,
+    log::*,
+    rand::{thread_rng, Rng},
+    solana_core::{sigverify::TransactionSigVerifier, sigverify_stage::SigVerifyStage},
+    solana_perf::{packet::to_packets_chunked, test_tx::test_tx},
+    solana_sdk::{
+        hash::Hash,
+        signature::{Keypair, Signer},
+        system_transaction,
+        timing::duration_as_ms,
+    },
+    std::{
+        sync::mpsc::channel,
+        time::{Duration, Instant},
+    },
+    test::Bencher,
+};
 
 #[bench]
 fn bench_packet_discard(bencher: &mut Bencher) {