Update notes for submitted changes

* These are directory restructuring changes in tools/packaging/openstack/debian, where packaging files have been moved to sku specific directories. With the following changes: Removed sku specific ifdefs from openstack/debian/Makfile Remvoed quantumclient and quantum targets. No special handling of nova packages in makefile, it was needed to use different changelog between grizzly and havana for nova cpy changelog.havana to changelog, eventually we will delete changelog.havana No special handling of icehouse targets for each target moved havana specifc packaging files to havana directory, only python-neutronclient has both havana and icehouse. For any new openstack release, new directory would be created if that target is needed with contrail-build