[testlib] Drop override of assertItemsEqual method
The override is not compatible with underlying (standard) method because it
builds sets and rely on eid.
Closes #3641111.
# -*- 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"""