Router's RT not removed from VN when subnet is disassociated from the router

R2.20 Build 39 Ubuntu 14.04 multi-node setup

This test test_basic_router_behavior failed in sanity on multiple testbeds

http://10.204.216.50/Docs/logs/2.20-39_2015_06_03_15_22_27/logs/testrouters.log
http://10.204.216.50/Docs/logs/2.20-39_2015_06_03_15_22_27/junit-noframes.html

Initially two vns were connected to a router. A ping was run from vms across the vns.
After disassociating one of the vns from the router, the ping was tried again and it passed

It is seen that in control-node, the router's RT continues to be present in import/export rt list of the VN which has been disassociated.

Below 8000004 shouldn't have been part of rt list of VN vn1-65598457
----------------

root@nodei21:~/contrail-test/logs# curl http://nodei22:8083/Snh_ShowRoutingInstanceReq?x=default-domain:TestRouters-11434480:vn1-65598457:vn1-65598457
<?xml-stylesheet type="text/xsl" href="/universal_parse.xsl"?><ShowRoutingInstanceResp type="sandesh"><instances type="list" identifier="1"><list type="struct" size="1"><ShowRoutingInstance><name type="string" identifier="1" link="ShowRoutingInstanceReq">default-domain:TestRouters-11434480:vn1-65598457:vn1-65598457</name><virtual_network type="string" identifier="3">default-domain:TestRouters-11434480:vn1-65598457</virtual_network><vn_index type="i32" identifier="6">162</vn_index><vxlan_id type="i32" identifier="8">0</vxlan_id><deleted type="bool" identifier="7">false</deleted><import_target type="list" identifier="4"><list type="string" size="2"><element>target:64512:8000002</element><element>target:64512:8000004</element></list></import_target><export_target type="list" identifier="5"><list type="string" size="2"><element>target:64512:8000002</element><element>target:64512:8000004</element></list></export_target><tables type="list" identifier="2"><list type="struct" size="4"><ShowRoutingInstanceTable><name type="string" identifier="1" link="ShowRouteReq">default-domain:TestRouters-11434480:vn1-65598457:vn1-65598457.ermvpn.0</name><deleted type="bool" identifier="13">false</deleted><peers type="list" identifier="2"><list type="string" size="1"><element>nodei24</element></list></peers><prefixes type="u64" identifier="3">2</prefixes><paths type="u64" identifier="4">2</paths><primary_paths type="u64" identifier="5">2</primary_paths><secondary_paths type="u64" identifier="6">0</secondary_paths><infeasible_paths type="u64" identifier="7">0</infeasible_paths><walk_requests type="u64" identifier="8">696</walk_requests><walk_completes type="u64" identifier="9">696</walk_completes><walk_cancels type="u64" identifier="10">0</walk_cancels><pending_updates type="u64" identifier="11">0</pending_updates><markers type="u64" identifier="12">0</markers></ShowRoutingInstanceTable><ShowRoutingInstanceTable><name type="string" identifier="1" link="ShowRouteReq">default-domain:TestRouters-11434480:vn1-65598457:vn1-65598457.evpn.0</name><deleted type="bool" identifier="13">false</deleted><peers type="list" identifier="2"><list type="string" size="1"><element>nodei24</element></list></peers><prefixes type="u64" identifier="3">5</prefixes><paths type="u64" identifier="4">8</paths><primary_paths type="u64" identifier="5">5</primary_paths><secondary_paths type="u64" identifier="6">3</secondary_paths><infeasible_paths type="u64" identifier="7">0</infeasible_paths><walk_requests type="u64" identifier="8">696</walk_requests><walk_completes type="u64" identifier="9">696</walk_completes><walk_cancels type="u64" identifier="10">0</walk_cancels><pending_updates type="u64" identifier="11">0</pending_updates><markers type="u64" identifier="12">0</markers></ShowRoutingInstanceTable><ShowRoutingInstanceTable><name type="string" identifier="1" link="ShowRouteReq">default-domain:TestRouters-11434480:vn1-65598457:vn1-65598457.inet.0</name><deleted type="bool" identifier="13">false</deleted><peers type="list" identifier="2"><list type="string" size="1"><element>nodei24</element></list></peers><prefixes type="u64" identifier="3">2</prefixes><paths type="u64" identifier="4">4</paths><primary_paths type="u64" identifier="5">1</primary_paths><secondary_paths type="u64" identifier="6">3</secondary_paths><infeasible_paths type="u64" identifier="7">0</infeasible_paths><walk_requests type="u64" identifier="8">696</walk_requests><walk_completes type="u64" identifier="9">696</walk_completes><walk_cancels type="u64" identifier="10">0</walk_cancels><pending_updates type="u64" identifier="11">0</pending_updates><markers type="u64" identifier="12">0</markers></ShowRoutingInstanceTable><ShowRoutingInstanceTable><name type="string" identifier="1" link="ShowRouteReq">default-domain:TestRouters-11434480:vn1-65598457:vn1-65598457.inet6.0</name><deleted type="bool" identifier="13">false</deleted><peers type="list" identifier="2"><list type="string" size="1"><element>nodei24</element></list></peers><prefixes type="u64" identifier="3">0</prefixes><paths type="u64" identifier="4">0</paths><primary_paths type="u64" identifier="5">0</primary_paths><secondary_paths type="u64" identifier="6">0</secondary_paths><infeasible_paths type="u64" identifier="7">0</infeasible_paths><walk_requests type="u64" identifier="8">696</walk_requests><walk_completes type="u64" identifier="9">696</walk_completes><walk_cancels type="u64" identifier="10">0</walk_cancels><pending_updates type="u64" identifier="11">0</pending_updates><markers type="u64" identifier="12">0</markers></ShowRoutingInstanceTable></list></tables></ShowRoutingInstance></list></instances><more type="bool" identifier="0">false</more></ShowRoutingInstancroot@nodei21:~/contrail-test/logs# neutron router-port-list router1-61519645
+--------------------------------------+--------------------------------------+-------------------+-------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+--------------------------------------+-------------------+-------------------------------------------------------------------------------------+
| 30b53362-e202-4fa9-8c2b-c86f6b2215dd | 30b53362-e202-4fa9-8c2b-c86f6b2215dd | 02:30:b5:33:62:e2 | {"subnet_id": "b2800a69-d057-42e9-a9a4-3155a3cc7ca6", "ip_address": "17.175.167.1"} |
+--------------------------------------+--------------------------------------+-------------------+-------------------------------------------------------------------------------------+
root@nodei21:~/contrail-test/logs# neutron net-list
+--------------------------------------+-------------------------+--------------------------------------------------------+
| id | name | subnets |
+--------------------------------------+-------------------------+--------------------------------------------------------+
| 53d5b3d9-161e-4963-a466-5e0a59f98db1 | __link_local__ | |
| fbb4b58d-a0dc-41c5-9cc7-2d1b96db8f2b | vn2-05628589 | b2800a69-d057-42e9-a9a4-3155a3cc7ca6 17.175.167.0/24 |
| 6bad201c-c572-445f-ac05-2dfe9e91eddc | in_network_vn2-11083564 | 326338f3-384d-476c-a9c3-a25235e5b07a 200.1.1.0/24 |
| 391f04de-3e8e-4cf1-b42a-957f32772f57 | ip-fabric | |
| 18a1773e-3cdc-41bf-bba8-843eee9dddee | default-virtual-network | |
| ce602f46-7104-41aa-a2ce-29ced2fefc06 | vn1-65598457 | e1d526b8-8835-4202-97c2-015926297239 183.197.221.0/24 |
| b7be1233-410b-4359-8c34-fd28566f5f57 | public | 2ec79d14-2812-4daa-b52a-c00c47da6bc5 10.204.221.192/28 |
+--------------------------------------+-------------------------+--------------------------------------------------------+
root@nodei21:~/contrail-test/logs# curl -u admin:contrail123 http://127.0.0.1:8095/logical-router/14f64061-440f-44fc-8240-906c3f22fcc6 | python -m json.tool
  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed
100 1331 100 1331 0 0 248k 0 --:--:-- --:--:-- --:--:-- 324k
{
    "logical-router": {
        "display_name": "router1-61519645",
        "fq_name": [
            "default-domain",
            "TestRouters-11434480",
            "router1-61519645"
        ],
        "href": "http://127.0.0.1:8095/logical-router/14f64061-440f-44fc-8240-906c3f22fcc6",
        "id_perms": {
            "created": "2015-06-03T17:00:59.639054",
            "creator": null,
            "description": null,
            "enable": true,
            "last_modified": "2015-06-03T17:01:06.001440",
            "permissions": {
                "group": "KeystoneServiceAdmin",
                "group_access": 7,
                "other_access": 7,
                "owner": "admin",
                "owner_access": 7
            },
            "user_visible": true,
            "uuid": {
                "uuid_lslong": 9385660418030238918,
                "uuid_mslong": 1510465511527236860
            }
        },
        "name": "router1-61519645",
        "parent_href": "http://127.0.0.1:8095/project/144097d4-89b0-4820-ac16-e5d1d985bba2",
        "parent_type": "project",
        "parent_uuid": "144097d4-89b0-4820-ac16-e5d1d985bba2",
        "route_target_refs": [
            {
                "attr": null,
                "href": "http://127.0.0.1:8095/route-target/dd77ee1f-6882-4b05-a369-e6c7404b48cb",
                "to": [
                    "target:64512:8000004"
                ],
                "uuid": "dd77ee1f-6882-4b05-a369-e6c7404b48cb"
            }
        ],
        "uuid": "14f64061-440f-44fc-8240-906c3f22fcc6",
        "virtual_machine_interface_refs": [
            {
                "attr": null,
                "href": "http://127.0.0.1:8095/virtual-machine-interface/30b53362-e202-4fa9-8c2b-c86f6b2215dd",
                "to": [
                    "default-domain",
                    "TestRouters-11434480",
                    "30b53362-e202-4fa9-8c2b-c86f6b2215dd"
                ],
                "uuid": "30b53362-e202-4fa9-8c2b-c86f6b2215dd"
            }
        ]
    }
}
root@nodei21:~/contrail-test/logs#