Comment 2 for bug 1586584

maybe the command looks like "neutron net-device-topology-list", we can get the count about routers, dhcp agents, instances which connect to every network. The command looks like "neutron net-device-topology-show net_id", we can get more details about devices which connect to the specified network. For every device ,we can know tenant_id, host node, zone, connect_port_id, subnet_id, ip_address