set the storage class or require the default storage class be exist

[nobody4t]

The doc here does not set the storage class and default value for console storage class name is default which is not good. This will cause pvc pending when to create console.

solution:

1. update the example to set the storage class name in playbook.
   or
2. state that the default storage class should exist or should set with command:

oc annotate sc StorageClassName storageclass.kubernetes.io/is-default-class=true