Flaky tasks test glance.tests.unit.v2.test_tasks_resource.TestTasksController.test_create_with_live_time

We get constantly failures like:
2015-10-13 06:59:05.343 | ======================================================================
2015-10-13 06:59:05.343 | FAIL: glance.tests.unit.v2.test_tasks_resource.TestTasksController.test_create_with_live_time
2015-10-13 06:59:05.344 | tags: worker-7
2015-10-13 06:59:05.344 | ----------------------------------------------------------------------
2015-10-13 06:59:05.344 | Traceback (most recent call last):
2015-10-13 06:59:05.344 | File "/home/jenkins/workspace/gate-glance-python27/.tox/py27/local/lib/python2.7/site-packages/mock/mock.py", line 1305, in patched
2015-10-13 06:59:05.344 | return func(*args, **keywargs)
2015-10-13 06:59:05.344 | File "glance/tests/unit/v2/test_tasks_resource.py", line 365, in test_create_with_live_time
2015-10-13 06:59:05.344 | self.assertEqual(CONF.task.task_time_to_live, task_live_time_hour)
2015-10-13 06:59:05.344 | File "/home/jenkins/workspace/gate-glance-python27/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 350, in assertEqual
2015-10-13 06:59:05.344 | self.assertThat(observed, matcher, message)
2015-10-13 06:59:05.344 | File "/home/jenkins/workspace/gate-glance-python27/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 435, in assertThat
2015-10-13 06:59:05.345 | raise mismatch_error
2015-10-13 06:59:05.345 | testtools.matchers._impl.MismatchError: 48 != 47
2015-10-13 06:59:05.345 | Ran 2855 tests in 298.484s
2015-10-13 06:59:05.345 | FAILED (id=0, failures=1, skips=2)
2015-10-13 06:59:05.345 | error: testr failed (1)
2015-10-13 06:59:05.394 | ERROR: InvocationError: '/home/jenkins/workspace/gate-glance-python27/.tox/py27/bin/lockutils-wrapper python setup.py testr --slowest --testr-args='

This is caused if the second of timestamp changes between created_at and updated_at gets created.