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_msgbase.py b/osm_common/tests/test_msgbase.py
index 665968e..d5092b1 100644
--- a/osm_common/tests/test_msgbase.py
+++ b/osm_common/tests/test_msgbase.py
@@ -18,9 +18,9 @@
 ##
 
 import http
-import pytest
 
 from osm_common.msgbase import MsgBase, MsgException
+import pytest
 
 
 def exception_message(message):