NFS usage acknowledgements in OpenShift Install/Upgrade

Issue

• My 3.9 upgrade or install is failing when I set any of the following:

  • openshift_hosted_registry_storage_kind=nfs
  • openshift_loggingops_storage_kind=nfs
  • openshift_logging_storage_kind=nfs
  • openshift_metrics_storage_kind=nfs
  • openshift_prometheus_alertbuffer_storage_kind=nfs
  • openshift_prometheus_alertmanager_storage_kind=nfs
  • openshift_prometheus_storage_kind=nfs

• I am seeing the following messages when upgrading or installing an OCP 3.9.z cluster

TASK [Run variable sanity checks] **********************************************
Wednesday 16 May 2018  22:54:02 -0400 (0:00:00.863)       0:00:24.573 ********* 
fatal: [host.example.com]: FAILED! => {"failed": true, "msg": "last_checked_host: host.example.com, last_checked_var: openshift_hosted_registry_storage_kind;nfs is an unsupported type for openshift_hosted_registry_storage_kind. openshift_enable_unsupported_configurations=True mustbe specified to continue with this configuration."}