Functional Tests Fail on Python 2.7.13

[underscoreer]

Working with a fresh clone of glance.

When running `tox -e py27` with Python 2.7.13, many functional tests fail from timing out.

When doing the same with 2.7.12, all tests pass.

Example of a failing test:

glance.tests.functional.test_cache_middleware.TestImageCacheManageSqlite.test_queue_and_prefetch
------------------------------------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "glance/tests/utils.py", line 181, in wrapped
        func(*a, **kwargs)
      File "glance/tests/functional/test_cache_middleware.py", line 926, in test_queue_and_prefetch
        self.start_servers(**self.__dict__.copy())
      File "glance/tests/functional/__init__.py", line 804, in start_servers
        self.start_with_retry(self.api_server, 'api_port', 3, **kwargs)
      File "glance/tests/functional/__init__.py", line 782, in start_with_retry
        self.assertTrue(launch_msg is None, launch_msg)
      File "/home/jacobestelle/glance/.tox/py27/lib/python2.7/site-packages/unittest2/case.py", line 702, in assertTrue
        raise self.failureException(msg)
    AssertionError: False is not true : Unexpected server launch status for: api,
    strace:

[Gleb Zimin (gzimin)]

Did you download glance from master branch?

[Brian Rosmaita (brian-rosmaita)]

Couldn't reproduce this at the time it was filed, but it suddenly began happening in the CI gate recently. Fix is filed under the other bug. (Marking this as a duplicate.)