The current latest packages in the CentOS repository (as installed by openshift-ansible) are 1.2.0-2.el7. The version of OpenShift in these packages is actually v1.2.0-rc1-13-g2e62fab. This causes OpenShift to attempt to download an origin-pod image with that tag, which does not exist. This prevents all pods from starting. The repository does not appear to contain the last known good packages, which are 1.2.0-1.el7.