[devtools/testlib] Use actual 'admin' user configuration values
Previously ``db-user`` and ``db-password`` configuration values were used to
fill ``admlogin`` and `admpassword`` attributes of CubicWebTC. The correct
data for these should read from `[admin]` section.
Closes #4065070.
# -*- 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"""