[FBR] fix openshift

Good Morning Everyone, This morning as I was trying to build a new distgit-bugzilla-sync build in staging, I ran into the issue that the build never started. It seems it was related to openshift not being able to resolve correctly: registry.redhat.io. Once Clément pointed me to the right direction, I adjusted staging as follow: https://infrastructure.fedoraproject.org/cgit/ansible.git/commit/?id=e371... and I was able to do a new build. I would like to apply the same fix to production (ie: roles/hosts/files/os-hosts). Thoughts? Thanks, Pierre