[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.
#! /bin/sh -e#if [ "$1" = configure ]; then if which install-docs >/dev/null 2>&1; then install-docs -i /usr/share/doc-base/cubicweb-doc fifi#DEBHELPER#exit 0