Current, users can config default datastore registry for managers not by
verions. This make you can flexible when have some experimental
datastore.
With this patch, users with the administrator role can configure the
datastore registry external for each datastore version using a command,
without editing configuration files.
Story: #2010860
Task: #48534
Change-Id: I910a1ba4a9216ab29faeed03198113b4acb2cb81
b127068c20