Test failures due to float precision (?)

[Dmitry Tantsur]

I've seen the following failure:

ft1.52: futurist.tests.test_executors.TestExecutors.test_gather_stats(thread)_StringException: Empty attachments:
  stderr
  stdout

Traceback (most recent call last):
  File "futurist/tests/test_executors.py", line 82, in test_gather_stats
    self.assertGreaterEqual(self.executor.statistics.runtime, 0.2)
  File "/home/jenkins/workspace/gate-futurist-python27/.tox/py27/local/lib/python2.7/site-packages/unittest2/case.py", line 1239, in assertGreaterEqual
    self.fail(self._formatMessage(msg, standardMsg))
  File "/home/jenkins/workspace/gate-futurist-python27/.tox/py27/local/lib/python2.7/site-packages/unittest2/case.py", line 690, in fail
    raise self.failureException(msg)
AssertionError: 0.19990993199999707 not greater than or equal to 0.2

http://logs.openstack.org/48/217148/1/check/gate-futurist-python27/44fce5e/testr_results.html.gz

[ChangBo Guo(gcb) (glongwave)]

Fix https://review.openstack.org/#/c/217963/ was merged.