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/fsmongo.py b/osm_common/fsmongo.py
index d923842..1ce5909 100644
--- a/osm_common/fsmongo.py
+++ b/osm_common/fsmongo.py
@@ -15,17 +15,16 @@
 # For those usages not covered by the Apache License, Version 2.0 please
 # contact: eduardo.sousa@canonical.com
 ##
-
+import datetime
 import errno
 from http import HTTPStatus
 from io import BytesIO, StringIO
 import logging
 import os
-import datetime
 import tarfile
 import zipfile
 
-from gridfs import GridFSBucket, errors
+from gridfs import errors, GridFSBucket
 from osm_common.fsbase import FsBase, FsException
 from pymongo import MongoClient