Termination Point (Gre Interface) not getting removed from the switch.

Unable to delete Termination point from the Switch. The Entry is getting removed from the Ovsdb Configuration Database.
Please see below for detailed steps...
Also, look for the below attachments:
1. ODL logs (trace mode) – Look in karaf.log.tpdelete.txt timestamp between: 2015-11-16 01:28:48 & 2015-11-16 01:29:02
2. In the tp-delete.pcapng, look at frames 41 & 43.

Detailed steps to reproduce this issue:
---------------------------------------
STEP 1: After connecting the Ovs, before creating the TP.

GET:
http://192.168.56.104:8181/restconf/operational/network-topology:network-topology/

"network-topology": {
"topology": [
{
"topology-id": "ovsdb:1",
"node": [
{
"node-id": "ovsdb://uuid/72391c99-db7f-40b6-a65a-56de332791b5/bridge/s1",
"termination-point": [

{ "tp-id": "s1", "ovsdb:port-uuid": "9296d57a-345b-4b59-ab40-8f5af1897117", "ovsdb:ofport": 65534, "ovsdb:interface-type": "ovsdb:interface-type-internal", "ovsdb:interface-uuid": "f3b5a2b3-fc2d-48e4-852d-2135bf5b7d09", "ovsdb:name": "s1" }

,

{ "tp-id": "s1-eth1", "ovsdb:port-uuid": "8cdd8fa7-da99-4fe6-a18b-01678bffbe11", "ovsdb:ofport": 1, "ovsdb:interface-uuid": "2ae1f628-501e-4bd1-b6e0-75cde1ea0a15", "ovsdb:name": "s1-eth1" }

],
"ovsdb:controller-entry": [

{ "target": "ptcp:6634", "is-connected": false, "controller-uuid": "dc7797df-d4c6-4b36-badb-4ddc0c5394bd" }

,

{ "target": "tcp:192.168.56.104:6653", "is-connected": true, "controller-uuid": "8c43c7a5-efec-4deb-90d8-567d0721935c" }

],
"ovsdb:bridge-name": "s1",
"ovsdb:datapath-type": "ovsdb:datapath-type-system",
"ovsdb:datapath-id": "00:00:00:00:00:00:00:01",
"ovsdb:managed-by": "/network-topology:network-topology/network-topology:topology[network-topology:topology-id='ovsdb:1']/network-topology:node[network-topology:node-id='ovsdb://uuid/72391c99-db7f-40b6-a65a-56de332791b5']",
"ovsdb:bridge-openflow-node-ref": "/network-topology:network-topology/network-topology:topology[network-topology:topology-id='ovsdb:1']/network-topology:node[network-topology:node-id='ovsdb://uuid/72391c99-db7f-40b6-a65a-56de332791b5']",
"ovsdb:fail-mode": "ovsdb:ovsdb-fail-mode-secure",
"ovsdb:protocol-entry": [

{ "protocol": "ovsdb:ovsdb-bridge-protocol-openflow-13" }

],
"ovsdb:bridge-uuid": "d797bdde-9f78-4bf1-9ed5-1c6c281230ad",
"ovsdb:bridge-other-configs": [

{ "bridge-other-config-key": "datapath-id", "bridge-other-config-value": "0000000000000001" }

]
},
{
"node-id": "ovsdb://uuid/72391c99-db7f-40b6-a65a-56de332791b5",
"ovsdb:managed-node-entry": [

{ "bridge-ref": "/network-topology:network-topology/network-topology:topology[network-topology:topology-id='ovsdb:1']/network-topology:node[network-topology:node-id='ovsdb://uuid/72391c99-db7f-40b6-a65a-56de332791b5/bridge/s1']" }

],
"ovsdb:ovs-version": "2.3.1",
"ovsdb:openvswitch-external-ids": [

{ "external-id-key": "system-id", "external-id-value": "c0e3b61f-a6d6-497f-a0b5-2c64dd058d5f" }

],
"ovsdb:connection-info":

{ "local-port": 6640, "local-ip": "192.168.56.104", "remote-ip": "192.168.56.104", "remote-port": 52475 }

}
]
},

---------------------------------------------------------------
On the switch before TP creation.

mininet> sh ovs-vsctl show
72391c99-db7f-40b6-a65a-56de332791b5
Manager "tcp:192.168.56.104:6640"
is_connected: true
Bridge "s1"
Controller "tcp:192.168.56.104:6653"
is_connected: true
Controller "ptcp:6634"
fail_mode: secure
Port "s1-eth1"
Interface "s1-eth1"
Port "s1"
Interface "s1"
type: internal
ovs_version: "2.3.1"
mininet>
-----------------------------------------------------------------

STEP 2: Creating the TP:
POST:
http://192.168.56.104:8181/restconf/config/network-topology:network-topology/topology/ovsdb%3A1/node/ovsdb%3A%2F%2Fuuid%2F72391c99-db7f-40b6-a65a-56de332791b5%2Fbridge%2Fs1/

{
"termination-point": [
{
"tp-id": "dp1.4-interface-2",
"ovsdb:interface-type": "ovsdb:interface-type-gre",
"ovsdb:options": [

{ "option": "key", "value": "flow" }

,

{ "option": "local_ip", "value": "10.1.1.2" }

,

{ "option": "remote_ip", "value": "10.1.1.4" }

],
"ovsdb:name": "dp1.4-interface-2"
}
]
}
----------------
On The Switch:

mininet> sh ovs-vsctl show
72391c99-db7f-40b6-a65a-56de332791b5
Manager "tcp:192.168.56.104:6640"
is_connected: true
Bridge "s1"
Controller "tcp:192.168.56.104:6653"
is_connected: true
Controller "ptcp:6634"
fail_mode: secure
Port "dp1.4-interface-2"
Interface "dp1.4-interface-2"
type: gre
options:

{key=flow, local_ip="10.1.1.2", remote_ip="10.1.1.4"}
Port "s1-eth1"
Interface "s1-eth1"
Port "s1"
Interface "s1"
type: internal
ovs_version: "2.3.1"
mininet>

-------------------------------
GET: (Topology Config DS)
http://192.168.56.104:8181/restconf/config/network-topology:network-topology/

{
"network-topology": {
"topology": [
{
"topology-id": "ovsdb:1",
"node": [
{
"node-id": "ovsdb://uuid/72391c99-db7f-40b6-a65a-56de332791b5/bridge/s1",
"termination-point": [
{
"tp-id": "dp1.4-interface-2",
"ovsdb:options": [
{ "option": "key", "value": "flow" },
{ "option": "remote_ip", "value": "10.1.1.4" },
{ "option": "local_ip", "value": "10.1.1.2" }
],
"ovsdb:interface-type": "ovsdb:interface-type-gre",
"ovsdb:name": "dp1.4-interface-2"
}
]
}
]
}
]
}
}


GET:
http://192.168.56.104:8181/restconf/config/network-topology:network-topology/topology/ovsdb%3A1/node/ovsdb%3A%2F%2Fuuid%2F72391c99-db7f-40b6-a65a-56de332791b5%2Fbridge%2Fs1/termination-point/dp1.4-interface-2/
{
"termination-point": [
{
"tp-id": "dp1.4-interface-2",
"ovsdb:options": [
{ "option": "key", "value": "flow" },
{ "option": "remote_ip", "value": "10.1.1.4" },
{ "option": "local_ip", "value": "10.1.1.2" }
],
"ovsdb:interface-type": "ovsdb:interface-type-gre",
"ovsdb:name": "dp1.4-interface-2"
}
]
}

STEP 3: Delete the TP.
DELETE:
http://192.168.56.104:8181/restconf/config/network-topology:network-topology/topology/ovsdb%3A1/node/ovsdb%3A%2F%2Fuuid%2F72391c99-db7f-40b6-a65a-56de332791b5%2Fbridge%2Fs1/termination-point/dp1.4-interface-2/


GET:
http://192.168.56.104:8181/restconf/config/network-topology:network-topology/topology/ovsdb%3A1/node/ovsdb%3A%2F%2Fuuid%2F72391c99-db7f-40b6-a65a-56de332791b5%2Fbridge%2Fs1/termination-point/dp1.4-interface-2/

{
"errors": {
"error": [
{ "error-type": "application", "error-tag": "data-missing", "error-message": "Request could not be completed because the relevant data model content does not exist " }
]
}
}


On the switch:
mininet> sh ovs-vsctl show
72391c99-db7f-40b6-a65a-56de332791b5
Manager "tcp:192.168.56.104:6640"
is_connected: true
Bridge "s1"
Controller "tcp:192.168.56.104:6653"
is_connected: true
Controller "ptcp:6634"
fail_mode: secure
Port "dp1.4-interface-2"
Interface "dp1.4-interface-2"
type: gre
options: {key=flow, local_ip="10.1.1.2", remote_ip="10.1.1.4"}

Port "s1-eth1"
Interface "s1-eth1"
Port "s1"
Interface "s1"
type: internal
ovs_version: "2.3.1"
mininet>

------------------------------------------