'Delete fip namespace after external network removed.'

def fipnamespace_delete_on_ext_net(self, context, ext_net_id):

    fip_ns = self.get_fip_ns(ext_net_id)
    if (fip_ns.agent_gateway_port and (not fip_ns.destroyed)):
        fip_ns.unsubscribe(ext_net_id)
        fip_ns.delete()
