Add Python 3 Train unit tests
See the Train python3-updates goal document for details: https://governance.openstack.org/tc/goals/train/python3-updates.html Change-Id: I11f7aafdfb3a45569b021df748ea32ebddc4ba6b
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See the Train python3-updates goal document for details: https://governance.openstack.org/tc/goals/train/python3-updates.html Change-Id: I11f7aafdfb3a45569b021df748ea32ebddc4ba6b