Comment 1 for bug 1245920

It's looks like, that there is some dependencies between tests...
This test reproduced if we run tests only for test_node_manager. For example, you can use such command to get this error:

tox -e py27 -- ironic.tests.conductor.test_node_manager

By the way, tests passed with no issues, if tests module test_manager runs before test_node_manager.