Fix db error when running python34 unit tests
If tests for py27 is executed before py34 tests, then there is a chance that py34 related tests may fail.The following patch fixes it. Ref: https://review.openstack.org/#/q/status:merged++topic:bug/1489059,n,z TrivialFix Change-Id: I612cb460e89e86cb1321c3dfd5aac07e1f17e85b Closes-bug: #1489059
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