[test] update unittest_predicates to 3.19 api
[jcr: use self.admin_access instead of creating a new one each time]
#! /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