libs/core: fix undefined tostring() in network model
libs/core: fix undefined tostring() in network model


deepak78/luci,deepak78/luci,deepak78/luci,deepak78/luci,deepak78/luci,8devices/luci,8devices/luci,8devices/luci,deepak78/luci,8devices/luci,deepak78/luci,deepak78/luci,8devices/luci,8devices/luci