[tests] remove unused imports from utils.py

test/functional/bip9-softforks.py

@@ -15,6 +15,10 @@ mine a further 143 blocks (LOCKED_IN)
 test that enforcement has not triggered (which triggers ACTIVE)
 test that enforcement has triggered
 """
+from io import BytesIO
+import shutil
+import time
+import itertools
 
 from test_framework.test_framework import ComparisonTestFramework
 from test_framework.util import *
@@ -22,9 +26,6 @@ from test_framework.mininode import CTransaction, NetworkThread
 from test_framework.blocktools import create_coinbase, create_block
 from test_framework.comptool import TestInstance, TestManager
 from test_framework.script import CScript, OP_1NEGATE, OP_CHECKSEQUENCEVERIFY, OP_DROP
-from io import BytesIO
-import time
-import itertools
 
 class BIP9SoftForksTest(ComparisonTestFramework):
 

test/functional/test_framework/util.py

@@ -5,7 +5,6 @@
 """Helpful routines for regression testing."""
 
 import os
-import sys
 
 from binascii import hexlify, unhexlify
 from base64 import b64encode
@@ -13,7 +12,6 @@ from decimal import Decimal, ROUND_DOWN
 import json
 import http.client
 import random
-import shutil
 import subprocess
 import tempfile
 import time

test/functional/walletbackup.py

@@ -30,10 +30,11 @@ confirm 1/2/3/4 balances are same as before.
 Shutdown again, restore using importwallet,
 and confirm again balances are correct.
 """
+from random import randint
+import shutil
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import *
-from random import randint
 
 class WalletBackupTest(BitcoinTestFramework):