NeutronException: An unknown exception occurred when tried to delete a port which attached to a router

[sajuptpm]

from neutron-server.log
========
2016-06-15 08:38:56.116 6960 INFO neutron.wsgi [req-ecf71870-43a5-42bc-818c-2a8e864f8687 ] 192.168.100.88,127.0.0.1 - - [15/Jun/2016 08:38:56] "GET /v2.0/networks.json?tenant_id=00000000000000000000012276693110 HTTP/1.1" 200 2602 0.129577
2016-06-15 08:38:56.394 6960 ERROR neutron.api.v2.resource [req-d9c1069d-ccf9-4a94-aba8-3e5fd4cc928a ] remove_router_interface failed
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource Traceback (most recent call last):
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 83, in resource
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource result = method(request=request, **args)
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 207, in _handle_action
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource return getattr(self._plugin, name)(*arg_list, **kwargs)
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py", line 600, in remove_router_interface
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource obj_name='remove_router_interface')
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin.py", line 249, in _raise_contrail_error
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource raise exc.NeutronException(**info)
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource NeutronException: An unknown exception occurred.
2016-06-15 08:38:56.394 6960 TRACE neutron.api.v2.resource
2016-06-15 08:38:56.398 6960 INFO neutron.wsgi [req-d9c1069d-ccf9-4a94-aba8-3e5fd4cc928a ] 192.168.100.88,127.0.0.1 - - [15/Jun/2016 08:38:56] "PUT /v2.0/routers/fcb01467-9f55-4943-a185-df0a9ae80708/remove_router_interface.json HTTP/1.1" 500 338 0.561269

from /var/log/contrail/contrail-api-0-stdout.log
======================
0 2043 0.040044
<pre>Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 875, in plugin_del_router_interface
    subnet_id=subnet_id)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 3457, in remove_router_interface
    self.port_delete(port_id)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 3741, in port_delete <=======
    device_owner=constants.DEVICE_OWNER_ROUTER_INTF)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 254, in _raise_contrail_exception
    bottle.abort(400, json.dumps(exc_info))
  File "/usr/lib/python2.7/dist-packages/bottle.py", line 2310, in abort
    raise HTTPError(code, text)
HTTPError
</pre>
192.168.100.88 - - [2016-06-14 14:49:30] "POST /neutron/router HTTP/1.1" 400 249 0.780767

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[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/21321
Submitter: sajuptpm (<email address hidden>)