Fragile Test: glance.tests.functional.v1.test_api:TestApi.test_zero_initial_size

As seen in http://logs.openstack.org/12465/4/check/gate-glance-python27/1801/console.html:

20:56:15 ======================================================================
20:56:15 FAIL: A test to ensure that an image with size explicitly set to zero
20:56:15 ----------------------------------------------------------------------
20:56:15 Traceback (most recent call last):
20:56:15 File "/home/jenkins/workspace/gate-glance-python27/glance/tests/utils.py", line 178, in wrapped
20:56:15 func(*a, **kwargs)
20:56:15 File "/home/jenkins/workspace/gate-glance-python27/glance/tests/functional/v1/test_api.py", line 493, in test_zero_initial_size
20:56:15 self.assertEqual(response.status, 201)
20:56:15 AssertionError: 404 != 201
20:56:15 '404 != 201' = '%s != %s' % (safe_repr(404), safe_repr(201))
20:56:15 '404 != 201' = self._formatMessage('404 != 201', '404 != 201')
20:56:15 >> raise self.failureException('404 != 201')