Revert "Reformat imports to a consistent style for imports"

This reverts commit 139d15cd84.

sdk/benches/serialize_instructions.rs

@@ -1,16 +1,12 @@
 #![feature(test)]
 
 extern crate test;
-use {
-    bincode::{deserialize, serialize},
-    solana_sdk::{
-        instruction::{AccountMeta, Instruction},
-        message::Message,
-        pubkey,
-        sysvar::instructions,
-    },
-    test::Bencher,
-};
+use bincode::{deserialize, serialize};
+use solana_sdk::instruction::{AccountMeta, Instruction};
+use solana_sdk::message::Message;
+use solana_sdk::pubkey;
+use solana_sdk::sysvar::instructions;
+use test::Bencher;
 
 fn make_instructions() -> Vec<Instruction> {
     let meta = AccountMeta::new(pubkey::new_rand(), false);

sdk/benches/short_vec.rs

@@ -1,7 +1,9 @@
 #![feature(test)]
 
 extern crate test;
-use {bincode::deserialize, solana_sdk::short_vec::ShortVec, test::Bencher};
+use bincode::deserialize;
+use solana_sdk::short_vec::ShortVec;
+use test::Bencher;
 
 // Return a ShortVec with 127 bytes
 fn create_encoded_short_vec() -> Vec<u8> {

sdk/benches/slot_hashes.rs

@@ -1,14 +1,12 @@
 #![feature(test)]
 
 extern crate test;
-use {
-    solana_sdk::{
-        account::{create_account_for_test, from_account},
-        hash::Hash,
-        slot_hashes::{Slot, SlotHashes, MAX_ENTRIES},
-    },
-    test::Bencher,
+use solana_sdk::{
+    account::{create_account_for_test, from_account},
+    hash::Hash,
+    slot_hashes::{Slot, SlotHashes, MAX_ENTRIES},
 };
+use test::Bencher;
 
 #[bench]
 fn bench_to_from_account(b: &mut Bencher) {

sdk/benches/slot_history.rs

@@ -1,13 +1,11 @@
 #![feature(test)]
 
 extern crate test;
-use {
-    solana_sdk::{
-        account::{create_account_for_test, from_account},
-        slot_history::SlotHistory,
-    },
-    test::Bencher,
+use solana_sdk::{
+    account::{create_account_for_test, from_account},
+    slot_history::SlotHistory,
 };
+use test::Bencher;
 
 #[bench]
 fn bench_to_from_account(b: &mut Bencher) {