test_policy_tables sometimes fails

[Aaron Rosen]

ft1.114: congress.dse.tests.test_dse.TestDSE.test_policy_tables_StringException: Traceback (most recent call last):
  File "/home/jenkins/workspace/gate-congress-python27/congress/dse/tests/test_dse.py", line 116, in test_policy_tables
    self.assertTrue(e, 'Policy insert 1')
  File "/usr/lib/python2.7/unittest/case.py", line 424, in assertTrue
    raise self.failureException(msg)
AssertionError: Policy insert 1

http://logs.openstack.org/45/127045/7/check/gate-congress-python27/56dba21/testr_results.html.gz

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/131850

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/131850
Committed: https://git.openstack.org/cgit/stackforge/congress/commit/?id=16aeeee27151e4e0e5b4283a3f48725ffafc1f31
Submitter: Jenkins
Branch: master

commit 16aeeee27151e4e0e5b4283a3f48725ffafc1f31
Author: Tim Hinrichs <email address hidden>
Date: Tue Oct 28 09:45:29 2014 -0700

    Make nondeterministic tests more robust

    Previously, we were testing the nondeterministic message
    bus DSE by publishing messages and sleeping for a second
    before proceeding with the test. On slow machines, a second
    was not always enough time and produced failures in Jenkins.

    This change uses the 'retrying' package to wait until
    a condition becomes true. And because dse now uses
    eventlet we can safely reduce the time we wait to
    much less than a second, thereby signficantly reducing
    the time we wait.

    Closes-bug: 1381917
    Closes-bug: 1381044
    Closes-bug: 1381043
    Change-Id: I2812351537cd330bd198c122d9804302781a10d3