Race condition in unit.test_commands.TestCreateTokenCommand

I get test failures from unit.test_commands.TestCreateTokenCommand sometimes. The test output in such a case is:

======================================================================
FAIL: test_create_unscoped_token (keystone.test.unit.test_commands.TestCreateTokenCommand)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/root/keystone/keystone/test/unit/test_commands.py", line 841, in test_create_unscoped_token
    str(None), self.tomorrow])
  File "/root/keystone/keystone/test/unit/test_commands.py", line 113, in assertTableContainsRow
    self.assertEquals(row, matching_row)
AssertionError: Lists differ: ['96d218ac8e15428a8894d5d8cab1... != [u'96d218ac8e15428a8894d5d8cab...

First differing element 3:
2012-01-26T15:39
2012-01-26T15:40

- ['96d218ac8e15428a8894d5d8cab16809',
+ [u'96d218ac8e15428a8894d5d8cab16809',
? +

- '30427734c2394284bb2965dd77b12313',
+ u'30427734c2394284bb2965dd77b12313',
? +

- 'None',
+ u'None',
? +

- '2012-01-26T15:39']
? ^^

+ u'2012-01-26T15:40']
? + ^^
======================================================================

This seems to be a race-condition. The above test run was started at 15:39:59 but the create_token command was run on 15:40:00. Because of this timestamp in the token datebase doesn't match the expected value.

I'll try to come up with a patch.