## What this PR does

This patch grants "admin" permissions to super-admins, "use" permissions
to admins and super-admins, "view" permissions to "use"-privileged
users, admins, and super-admins. Previously lower-privileged roles were
not assigned to higher-privileged users, so a viewer could excercise
their basic read-only permissions which were not available to
high-privilege users. This patch corrects the template function used to
generate subjects in rolebindings, fixing the issue.

### Release note

```release-note
[rbac] Fix issue of privileged users not having low-privilege read-only
permissions.
```

Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>
(cherry picked from commit 7ddd9cf)