Description of problem:
Version: OSP-10 Newton
Test failed : neutron.tests.tempest.api.test_timestamp.TestTimeStampWithL3.test_show_router_attribute_with_timestamp

At creation the timestamp is correct: u'created_at': u'2017-02-22T10:47:24Z', u'updated_at': u'2017-02-22T10:47:24Z'

when "show" function display the timestamp it display it with ~3 sec difference:
u'created_at': u'2017-02-22T10:47:24Z', u'updated_at': u'2017-02-22T10:47:26Z'

show function display incorrect timestamp

    218 def test_show_router_attribute_with_timestamp(self):
    219 router = self.create_router(router_name='test')
    220 import ipdb;ipdb.set_trace()
--> 221 body = self.client.show_router(router['id'])
    222 show_router = body['router']
    223 # verify the timestamp from creation and showed is same
    224 import ipdb;ipdb.set_trace()
    225 self.assertEqual(router['created_at'],
    226 show_router['created_at'])

ipdb> router
{u'status': u'ACTIVE', u'external_gateway_info': None, u'availability_zone_hints': [], u'availability_zones': [], u'description': u'', u'admin_state_up': False, u'tenant_id': u'8b9cd1ebd13f4172a0c63789ee9c0de2', u'created_at': u'2017-02-22T10:47:24Z', u'updated_at': u'2017-02-22T10:47:24Z', u'flavor_id': None, u'revision_number': 3, u'routes': [], u'project_id': u'8b9cd1ebd13f4172a0c63789ee9c0de2', u'id': u'545e74b0-2f3d-43b8-8678-93bbb3f1f6f3', u'name': u'test'}
ipdb> n
2017-02-22 10:47:55.084 6919 INFO tempest.lib.common.rest_client [req-eef7ded4-bb01-4401-96cd-325c01b2230b ] Request (TestTimeStampWithL3:test_show_router_attribute_with_timestamp): 200 GET http://10.0.0.104:9696/v2.0/routers/545e74b0-2f3d-43b8-8678-93bbb3f1f6f3 0.224s
2017-02-22 10:47:55.086 6919 DEBUG tempest.lib.common.rest_client [req-eef7ded4-bb01-4401-96cd-325c01b2230b ] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'status': '200', u'content-length': '462', 'content-location': 'http://10.0.0.104:9696/v2.0/routers/545e74b0-2f3d-43b8-8678-93bbb3f1f6f3', u'date': 'Wed, 22 Feb 2017 10:47:56 GMT', u'content-type': 'application/json', u'connection': 'close', u'x-openstack-request-id': 'req-eef7ded4-bb01-4401-96cd-325c01b2230b'}
        Body: {"router": {"status": "ACTIVE", "external_gateway_info": null, "availability_zone_hints": [], "availability_zones": ["nova"], "description": "", "admin_state_up": false, "tenant_id": "8b9cd1ebd13f4172a0c63789ee9c0de2", "created_at": "2017-02-22T10:47:24Z", "updated_at": "2017-02-22T10:47:26Z", "flavor_id": null, "revision_number": 8, "routes": [], "project_id": "8b9cd1ebd13f4172a0c63789ee9c0de2", "id": "545e74b0-2f3d-43b8-8678-93bbb3f1f6f3", "name": "test"}} _log_request_full tempest/lib/common/rest_client.py:431
> /home/centos/tempest-upstream/neutron/neutron/tests/tempest/api/test_timestamp.py(222)test_show_router_attribute_with_timestamp()

ipdb> router
{u'status': u'ACTIVE', u'external_gateway_info': None, u'availability_zone_hints': [], u'availability_zones': [], u'description': u'', u'admin_state_up': False, u'tenant_id': u'8b9cd1ebd13f4172a0c63789ee9c0de2', u'created_at': u'2017-02-22T10:47:24Z', u'updated_at': u'2017-02-22T10:47:24Z', u'flavor_id': None, u'revision_number': 3, u'routes': [], u'project_id': u'8b9cd1ebd13f4172a0c63789ee9c0de2', u'id': u'545e74b0-2f3d-43b8-8678-93bbb3f1f6f3', u'name': u'test'}
ipdb> show_router
{u'status': u'ACTIVE', u'external_gateway_info': None, u'availability_zone_hints': [], u'availability_zones': [u'nova'], u'description': u'', u'admin_state_up': False, u'tenant_id': u'8b9cd1ebd13f4172a0c63789ee9c0de2', u'created_at': u'2017-02-22T10:47:24Z', u'updated_at': u'2017-02-22T10:47:26Z', u'flavor_id': None, u'revision_number': 8, u'routes': [], u'project_id': u'8b9cd1ebd13f4172a0c63789ee9c0de2', u'id': u'545e74b0-2f3d-43b8-8678-93bbb3f1f6f3', u'name': u'test'}

Version-Release number of selected component (if applicable):
osp10 
[root@controller-0 ~]# rpm -qa |grep neutron
openstack-neutron-9.2.0-2.el7ost.noarch
python-neutron-lbaas-9.1.0-4.el7ost.noarch
python-neutronclient-6.0.0-2.el7ost.noarch
python-neutron-lib-0.4.0-1.el7ost.noarch
openstack-neutron-bigswitch-lldp-9.40.0-1.1.el7ost.noarch
python-neutron-9.2.0-2.el7ost.noarch
openstack-neutron-openvswitch-9.2.0-2.el7ost.noarch
openstack-neutron-ml2-9.2.0-2.el7ost.noarch
python-neutron-tests-9.2.0-2.el7ost.noarch
openstack-neutron-lbaas-9.1.0-4.el7ost.noarch
openstack-neutron-bigswitch-agent-9.40.0-1.1.el7ost.noarch
openstack-neutron-metering-agent-9.2.0-2.el7ost.noarch
puppet-neutron-9.5.0-1.el7ost.noarch
openstack-neutron-common-9.2.0-2.el7ost.noarch
openstack-neutron-sriov-nic-agent-9.2.0-2.el7ost.noarch

How reproducible:
always
setup : DFG-neutron-10_director-rhel-7.3-virthost-3cont_2comp-ipv4-vxlan-lvm-lbaas

Steps to Reproduce:
1.run this test: neutron.tests.tempest.api.test_timestamp.TestTimeStampWithL3.test_show_router_attribute_with_timestamp
2.
3.

Actual results:


Expected results:


Additional info: