Update notes for submitted changes

* cleanup of tools/packaging/third_party/Makefile, This is only used for centos build: 	removal of grizzly specific targets 	removal of spec files no longer needed 	change default sku to havana 	removed ifdef not needed after removing grizzly Next pass would be to move openstack client pacakges from tools/packaging/third_party to tools/packaging/openstack/centos_64/