Magnum: enable py34 voting
Magnum: enable py34 voting

All py34 patches are get merged, so add python3-job to magnum
template.

Change-Id: Idc1f4bfeeaf9f8b9640fc067177519d20a8ba613

Tesora/tesora-project-config,openstack-infra/project-config,dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config