Adding release notes and enabling import order check

Enabling Flake8 library import order check,
adding release_notes, enabling stage-test failing by tox results.

Change-Id: I490b4cb3fe5904f54d84f0ce9b41fe91ec8b4f5d
Signed-off-by: aticig <gulsum.atici@canonical.com>
diff --git a/osm_common/tests/test_dbmemory.py b/osm_common/tests/test_dbmemory.py
index 3c45527..9a0e749 100644
--- a/osm_common/tests/test_dbmemory.py
+++ b/osm_common/tests/test_dbmemory.py
@@ -16,17 +16,15 @@
 # For those usages not covered by the Apache License, Version 2.0 please
 # contact: esousa@whitestack.com or alfonso.tiernosepulveda@telefonica.com
 ##
-
+from copy import deepcopy
 import http
 import logging
-import pytest
 import unittest
-from unittest.mock import Mock
+from unittest.mock import MagicMock, Mock
 
-from unittest.mock import MagicMock
 from osm_common.dbbase import DbException
 from osm_common.dbmemory import DbMemory
-from copy import deepcopy
+import pytest
 
 __author__ = "Eduardo Sousa <eduardosousa@av.it.pt>"