neutron-vpnaas doesn't support local tox targets

[Boden R]

Today it appears the neutron-vpnaas doesn't support proper env setup for running tox targets locally. For more details see [1].

[1] http://lists.openstack.org/pipermail/openstack-dev/2018-June/131801.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/579166

[Boden R (boden)]

I don't plan to fix all this defect, but submitted some of the work under https://review.openstack.org/579166

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/579166
Committed: https://git.openstack.org/cgit/openstack/neutron-vpnaas/commit/?id=bb165298e0270ab3cdc0bd0afab4b51988db4d98
Submitter: Zuul
Branch: master

commit bb165298e0270ab3cdc0bd0afab4b51988db4d98
Author: Boden R <email address hidden>
Date: Fri Jun 29 08:06:45 2018 -0600

    add py3-dev tox target and update lower constraints zuul job

    This patch adds a py3-dev tox target for running py3 UTs locally.
    It also updates the local .zuul.yaml for a neutron-vpnaas specific
    lower constraints job that ensure neutron/master is installed.

    Change-Id: Iab9f134b17b56d765d5ac523d9b5a4b4d4e00fb7
    Partial-Bug: #1779335