Updated openstack/openstack
Project: openstack/oslo.messaging  3f9fc44bc6013eb1ef32044b73426da2555fd73f

Fix structure of unit tests in oslo.messaging (part 1)

Even in case of libraries and when they are not big like nova.
It is better to use next rules:

1) structure of tests directory is the same as a root of project
Tests directory will be well organized, and it will be simple to find
where to write tests

2) names for end modules should be test_<name_of_testing_module>.py

Change-Id: Ie13d1b709e863f6a9babaaa2bf1e042ef9251671