[transaction] initialize dbapi_request in __init__
There is not reason to have it implicitly declared.
The attribute is renamed to match its public name.
# -*- 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 specific hooks and operations"""