Updated openstack/openstack
Project: openstack/sahara  f41e9ef32eb5cbab787273bb88a9a66602023e0c

Group tests by class

It guarantees that all tests inside the test class will be executed in
sigle thread. It makes us able to group some tests that uses same
external resource into one tests execution thread to avoid races.
Example: tests that are use external MySQL/PostgreSQL.

Change-Id: I67f10d20ea84caa9335f909fb5f30da4b4e7f1ca