test: Fix pyflakes warnings

qa/rpc-tests/invalidtxrequest.py

@@ -8,8 +8,6 @@ from test_framework.test_framework import ComparisonTestFramework
 from test_framework.comptool import TestManager, TestInstance, RejectResult
 from test_framework.mininode import NetworkThread
 from test_framework.blocktools import create_block, create_coinbase, create_transaction
-import logging
-import copy
 import time
 
 

qa/rpc-tests/rest.py

@@ -12,7 +12,6 @@ from test_framework.util import assert_equal, assert_greater_than, \
     hex_str_to_bytes, start_nodes, connect_nodes_bi
 
 import struct
-import binascii
 import json
 from io import BytesIO
 from codecs import encode

qa/rpc-tests/test_framework/mininode.py

@@ -28,7 +28,7 @@ import asyncore
 import time
 import sys
 import random
-from binascii import hexlify, unhexlify
+from binascii import hexlify
 from io import BytesIO
 from codecs import encode
 import hashlib