create_tempfiles fails under py33

[Ben Nemec]

As seen in http://logs.openstack.org/51/124451/3/check/gate-oslo.concurrency-python33/7b5420b/console.html.gz

2014-09-26 21:21:31.880 | ERROR: tests.unit.test_lockutils.LockTestCase.test_deprecated_names
2014-09-26 21:21:31.880 | ----------------------------------------------------------------------
2014-09-26 21:21:31.880 | Traceback (most recent call last):
2014-09-26 21:21:31.880 | File "./tests/unit/test_lockutils.py", line 342, in test_deprecated_names
2014-09-26 21:21:31.880 | 'disable_process_locking=True'])
2014-09-26 21:21:31.880 | File "/home/jenkins/workspace/gate-oslo.concurrency-python33/.tox/py33/lib/python3.3/site-packages/oslotest/base.py", line 142, in create_tempfiles
2014-09-26 21:21:31.880 | os.write(fd, contents)
2014-09-26 21:21:31.880 | TypeError: 'str' does not support the buffer interface

[Ben Nemec (bnemec)]

Ah, this should be fixed by https://github.com/openstack/oslotest/commit/356f0603ca4af81527c80a00e04149a92aabdd7f but that hasn't been released yet.