Remove unused Python imports

test/functional/example_test.py

@@ -22,7 +22,6 @@ from test_framework.mininode import (
     mininode_lock,
     msg_block,
     msg_getdata,
-    NODE_NETWORK,
 )
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (

test/functional/test_framework/messages.py

@@ -24,7 +24,7 @@ import struct
 import time
 
 from test_framework.siphash import siphash256
-from test_framework.util import hex_str_to_bytes, bytes_to_hex_str, wait_until
+from test_framework.util import hex_str_to_bytes, bytes_to_hex_str
 
 MIN_VERSION_SUPPORTED = 60001
 MY_VERSION = 70014  # past bip-31 for ping/pong

test/functional/test_framework/test_framework.py

@@ -13,7 +13,6 @@ import shutil
 import sys
 import tempfile
 import time
-import traceback
 
 from .authproxy import JSONRPCException
 from . import coverage