[tests] remove unused imports from utils.py

test/functional/bip9-softforks.py

@@ -15,16 +15,17 @@
 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 *
 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

@@ -5,15 +5,13 @@
 """Helpful routines for regression testing."""
 
 import os
-import sys
 
 from binascii import hexlify, unhexlify
 from base64 import b64encode
 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 @@
 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):