Promote CentOS-7 job to voting for OSA os_neutron
Promote CentOS-7 job to voting for OSA os_neutron

The tests are successfully passing now - see
https://review.openstack.org/386526 as an example.

The jobs should now be promoted to voting.

Change-Id: Iab440a4d959c62ba76cf31b9188cbe9d6720c922

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