Enabling Flake8 and import sorting

Enabling flake8 verifications in tox.ini and adding import sorting.
All the plugins have been fixed for flake8 errors and the imports
have been sorted.

Change-Id: Icdefe9a877e891a683cc833315e4c3f94fffbab9
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/NG-RO/osm_ng_ro/ns_thread.py b/NG-RO/osm_ng_ro/ns_thread.py
index 5df74c5..01c894d 100644
--- a/NG-RO/osm_ng_ro/ns_thread.py
+++ b/NG-RO/osm_ng_ro/ns_thread.py
@@ -24,25 +24,23 @@
 A ro_task can contain several 'tasks', each one with a target, where to store the results
 """
 
-import logging
-import queue
-import threading
-import time
-import yaml
 from copy import deepcopy
 from http import HTTPStatus
+import logging
 from os import mkdir
-from importlib_metadata import entry_points
+import queue
 from shutil import rmtree
+import threading
+import time
 from unittest.mock import Mock
 
-# from osm_common import dbmongo, dbmemory, fslocal, fsmongo, msglocal, msgkafka, version as common_version
+from importlib_metadata import entry_points
 from osm_common.dbbase import DbException
-from osm_ro_plugin.vim_dummy import VimDummyConnector
-from osm_ro_plugin.sdn_dummy import SdnDummyConnector
-from osm_ro_plugin import vimconn, sdnconn
 from osm_ng_ro.vim_admin import LockRenew
-
+from osm_ro_plugin import sdnconn, vimconn
+from osm_ro_plugin.sdn_dummy import SdnDummyConnector
+from osm_ro_plugin.vim_dummy import VimDummyConnector
+import yaml
 
 __author__ = "Alfonso Tierno"
 __date__ = "$28-Sep-2017 12:07:15$"