Chore: Move to centos8-builder

Chore: Move to centos8-builder

jjb/multicloud/multicloud-openstack-vmware-java.yaml
jjb/multicloud/multicloud-openstack.yaml
jjb/music/music-distributed-kv-store.yaml
jjb/music/music-jar.yaml
jjb/oom/offline-installer.yaml
jjb/oom/oom-consul.yaml
jjb/oom/oom-oneclick-config.yaml
jjb/oom/oom-readiness.yaml
jjb/oom/oom-registrator.yaml
jjb/oom-platform-cert-manager/oom-platform-cert-manager.yaml
jjb/oom-platform-cert-service/oom-platform-cert-service.yaml
jjb/oom-platform-keycloak/oom-platform-keycloak.yaml
jjb/oom-utils/oom-utils.yaml
jjb/oparent/oparent.yaml
jjb/optf/optf-has.yaml

Issue-ID: CIMAN-33
Signed-off-by: Bengt Thuree <bthuree@linuxfoundation.org>
Change-Id: I5ac4449f799cdb8621ed52dccc23a5b1b2d0fdf3