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/sol_package.py b/osm_common/sol_package.py
index e336cd5..8af52b9 100644
--- a/osm_common/sol_package.py
+++ b/osm_common/sol_package.py
@@ -21,10 +21,10 @@
 # For those usages not covered by the Apache License, Version 2.0 please
 # contact: fbravo@whitestack.com or agarcia@whitestack.com
 ##
-
-import os
-import yaml
 import hashlib
+import os
+
+import yaml
 
 
 class SOLPackageException(Exception):