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In the Neutron CI meeting on 2018-10-02 [1] we decided on the proper approach for fullstack testing of Neutron in Zuul. The approach is: 1. There should be only one fullstack CI job, named "neutron-fullstack" 2. The neutron-fullstack job should invoke python3 in tox.ini This change implements the agreed-upon approach. Switching the nodeset to newer OS will be handled in a separate step [1] http://eavesdrop.openstack.org/meetings/neutron_ci/2018/neutron_ci.2018-10-02-16.00.html Co-Authored-By: Nate Johnston <nate.johnston@redhat.com> Change-Id: I37c1cb42b3a94532e7b7fea21a929a39fe63f00b