switch all official python projects to python3 publishing job
switch all official python projects to python3 publishing job

This patch updates the release jobs used by all python-based projects
so they use the new jobs that run under python3.

Change-Id: I0aad9581908c28d0012039fe6c4cc89e6e62efae
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack-infra/project-config,openstack-infra/project-config