[test] run unittest_migractions on postgresql
sqlite's lack of support for a bunch of alter table functionality means
some thing just don't get tested otherwise.
#! /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