Fix db error when running python34 Unit tests
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 by reordering the tests
from py27 -> py34 to py34 -> py27.

Ref: https://review.openstack.org/#/q/status:merged++topic:bug/1489059,n,z

TrivialFix

Change-Id: I721bd37ce9a796dcd92d44876e803294d06af5b6
Closes-bug: #1489059

openstack/neutron-vpnaas,openstack/neutron-vpnaas