neutron plugin_guess_func bad configuration after maintenance update

FUEL 8.0 with Midonet MEM 1.9 deployed over Ubuntu 14.04.

after applying maintenance update https://docs.mirantis.com/openstack/fuel/fuel-8.0/maintenance-updates.html#mu8-0-how-to-update

auxiliary function "plugin_guess_func" is bad configured, and the consequence is neutron-server not loading midonet plugins.

Expected result in /usr/share/neutron-common/plugin_guess_func:
        ;;
        "midonet.neutron.plugin_v1.MidonetPluginV2")
                NEUTRON_PLUGIN_NAME=Midonet
        ;;

Deployed result in /usr/share/neutron-common/plugin_guess_func:
 ;;
        "neutron.plugins.midonet.plugin.MidonetPluginV2")
                NEUTRON_PLUGIN_NAME=Midonet
        ;;

and the /etc/init/neutron.conf fails in:
neutron_core_plugin_to_plugin_name ${CURRENT_PLUGIN}
 neutron_plugin_ini_path ${NEUTRON_PLUGIN_NAME}
        [ -r "$NEUTRON_PLUGIN_CONFIG" ] && CONF_ARG="--config-file $NEUTRON_PLUGIN_CONFIG"
        exec start-stop-daemon --start --chuid neutron:neutron --exec /usr/bin/neutron-server -- \
            --config-file /etc/neutron/neutron.conf \
            $DAEMON_ARGS $CONF_ARG