using the Lithium re-design feature set "odl-openflowplugin-app-new-lldp-speaker"

after connecting one switch via mininet the switch is seen in the operational store, but does not get removed when the switch is disconnected.

mininet CLI:
sudo mn --controller=remote,ip=172.17.7.23 --topo linear,1 --switch ovsk,protocols=OpenFlow13

Logs:

[no nodes initially]
curl -s -u "admin:admin" -u "admin:admin" http://172.17.7.23:8181/restconf/operational/opendaylight-inventory:nodes/ | python -m json.tool
{
"nodes": {}
}

[after starting mininet, there is one expected node]
curl -s -u "admin:admin" -u "admin:admin" http://172.17.7.23:8181/restconf/operational/opendaylight-inventory:nodes/ | python -m json.tool
{
"nodes": {
"node": [
{
"flow-node-inventory:description": "None",
"flow-node-inventory:hardware": "Open vSwitch",
"flow-node-inventory:manufacturer": "Nicira, Inc.",
"flow-node-inventory:serial-number": "None",
"flow-node-inventory:software": "2.3.0",

<SNIP>

[switch is connected to port 6633]
netstat -na | egrep 6633
tcp6 0 0 :::6633 :::* LISTEN
tcp6 0 0 172.17.7.23:6633 172.17.7.30:49285 ESTABLISHED

[after stopping mininet the switch is disconnected]
netstat -na | egrep 6633
tcp6 0 0 :::6633 :::* LISTEN

[but the node is still seen in operational store]
{
"nodes": {
"node": [
{
"flow-node-inventory:description": "None",
"flow-node-inventory:hardware": "Open vSwitch",
"flow-node-inventory:manufacturer": "Nicira, Inc.",
"flow-node-inventory:serial-number": "None",
"flow-node-inventory:software": "2.3.0",