Prepare DNS role for centos8
Prepare DNS role for centos8

Change-Id: I0625d0db439fd991f6f371467f32202f766167d0

redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra,rdo-infra/ci-config