[connection] add logging method on connection
If we are to use this object like we currently do with session, we need to have
the logging method as a lot of code use them.
# -*- 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 schema"""