libs/core: various interface handling fixes in network model
libs/core: various interface handling fixes in network model


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