[transaction] initialize hook control attribute in Transaction
There is no reason to not initialize them in __init__ time. this simplify the
transaction code.
# -*- 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"""