mkcloud: always use latest SP3 base image for admin node
mkcloud: always use latest SP3 base image for admin node

aspiers/automation,gosipyan/automation,gosipyan/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,vmoravec/automation,vmoravec/automation,aspiers/automation,SUSE-Cloud/automation,aspiers/automation,aspiers/automation,gosipyan/automation,vmoravec/automation,gosipyan/automation,vmoravec/automation