make netconf.py stylish (#22839)

(flake8 stuff)

netconf.py:22:1: F401 're' imported but unused
netconf.py:23:1: F401 'socket' imported but unused
netconf.py:24:1: F401 'json' imported but unused
netconf.py:25:1: F401 'signal' imported but unused
netconf.py:31:1: F401 'ansible.module_utils.six.moves.StringIO' imported but unused

lib/ansible/plugins/connection/netconf.py

@@ -19,16 +19,11 @@ from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
 import os
-import re
-import socket
-import json
-import signal
 import logging
 
 from ansible import constants as C
 from ansible.errors import AnsibleConnectionFailure, AnsibleError
 from ansible.plugins.connection import ConnectionBase, ensure_connect
-from ansible.module_utils.six.moves import StringIO
 
 try:
     from ncclient import manager
@@ -46,6 +41,7 @@ except ImportError:
 
 logging.getLogger('ncclient').setLevel(logging.INFO)
 
+
 class Connection(ConnectionBase):
     ''' NetConf connections '''
 
@@ -136,4 +132,3 @@ class Connection(ConnectionBase):
     def fetch_file(self, in_path, out_path):
         """Fetch a file from remote to local"""
         pass
-