NSX-mh fails on port-update tempest test

When run tempest to test port-update, neutron server showed backtrace and error message.

Steps:

testr init
testr run tempest.api.network.test_allowed_address_pair

All software components are at stable/kilo:

openstack-neutron: stable/kilo
vmware-nsx: stable/kilo
tempest: stable/kilo

/var/log/neutron/server.log:

2015-10-15 16:24:18,579 INFO [neutron.wsgi] 24 10.225.90.184 - - [15/Oct/2015 16:24:18] "POST /v2.0/ports HTTP/1.1" 201 821 0.279101
2015-10-15 16:24:18,623 INFO [neutron.wsgi] 24 (19817) accepted ('10.225.90.184', 49607)
2015-10-15 16:24:18,653 DEBUG [neutron.api.v2.base] 597 Request body: {u'port': {u'allowed_address_pairs': [{u'ip_address': u'10.100.0.2', u'mac_address': u'54:52:00:67:e2:78'}, {u'ip_address': u'10.100.0.6', u'mac_address': u'54:52:00:99:1c:9c'}]}}
2015-10-15 16:24:18,753 ERROR [vmware_nsx.neutron.plugins.vmware.api_client.client] 115 Received error code: 409
2015-10-15 16:24:18,753 ERROR [vmware_nsx.neutron.plugins.vmware.api_client.client] 116 Server Error Message: Duplicate MAC address '54:52:00:67:e2:78' detected in logical switch 'd8c0712c-6d44-450f-8208-7523a909f747', collides with logical port '6afc86ec-f747-4d78-97bd-9523e897259a'
2015-10-15 16:24:18,753 ERROR [vmware_nsx.neutron.plugins.vmware.plugins.base] 1273 Unable to update port id: 6d2c2b1d-8b4a-4142-89a5-39ed24e4f480.
Traceback (most recent call last):
  File "/opt/openstack/neutron/2015.1.1.r1122/lib/python2.7/site-packages/vmware_nsx/neutron/plugins/vmware/plugins/base.py", line 1261, in update_port
    ret_port.get(addr_pair.ADDRESS_PAIRS))
  File "/opt/openstack/neutron/2015.1.1.r1122/lib/python2.7/site-packages/vmware_nsx/neutron/plugins/vmware/nsxlib/switch.py", line 325, in update_port
    cluster=cluster)
  File "/opt/openstack/neutron/2015.1.1.r1122/lib/python2.7/site-packages/vmware_nsx/neutron/plugins/vmware/nsxlib/__init__.py", line 101, in do_request
    res = cluster.api_client.request(*args)
  File "/opt/openstack/neutron/2015.1.1.r1122/lib/python2.7/site-packages/vmware_nsx/neutron/plugins/vmware/api_client/client.py", line 117, in request
    exception.ERROR_MAPPINGS[status](response)
  File "/opt/openstack/neutron/2015.1.1.r1122/lib/python2.7/site-packages/vmware_nsx/neutron/plugins/vmware/api_client/exception.py", line 91, in fourZeroNine
    raise Conflict()
Conflict: Request conflicts with configuration on a different entity.