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/sol004_package.py b/osm_common/sol004_package.py
index 813e52d..8a3cb95 100644
--- a/osm_common/sol004_package.py
+++ b/osm_common/sol004_package.py
@@ -55,9 +55,11 @@
                 └── charm.py
 """
 
-import yaml
 import datetime
 import os
+
+import yaml
+
 from .sol_package import SOLPackage