Comment 6 for bug 1521599

It can be reproduced locally by executing it multiple times, for example:

#!/usr/bin/env bash

for i in `seq 1 100`;
do
    echo "The counter is $i"
    .tox/py27/bin/python2.7 -m testtools.run nova.tests.unit.network.test_neutronv2.TestNeutronv2.test_deallocate_for_instance_2_with_requested
done

This raised the error 10 times in my local test setup.