Comment 3 for bug 1820865

It seems we are using pyroute1 0.5.4: http://logs.openstack.org/32/643732/5/check/neutron-fullstack/75a6569/tox/dsvm-fullstack-1.log

This is the latest version, which according to pypi was released in March 3: https://pypi.org/project/pyroute2/0.5.4/#history

To remove the possibility that 0.5.4 introduced or reintroduced the problem: https://review.openstack.org/#/c/647256/