Upload centos-7-nm image
Upload centos-7-nm image

This entry was missed in I43318f33d206c28e1f06ac7a8f07c3fb8c8f0626,
add it so the built image is uploaded to providers.

Change-Id: I674f25ba518bbaad8e24f3a1e438464315f98398

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