[connection] handle and explicitly life cycle on Connection
Like ClientConnection, Connection object need to be explicitly started and stop.
They aims to be used as context manager.
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s entity's classes"""