Fix usersettings identifier creation

Usernames can contain all kinds of characters that are not allowed in resource names. Hash the name instead and use hex representation of the result to get a usable identifier.    

    4.16

    Always

    1. log in to the web console configured with a login to a 3rd party OIDC provider
    2. go to the User Preferences page / check the logs in the javascript console
    

The User Preferences page shows empty values instead of defaults.
The javascript console reports things like
```
consoleFetch failed for url /api/kubernetes/api/v1/namespaces/openshift-console-user-settings/configmaps/user-settings-kubeadmin r: configmaps "user-settings-kubeadmin" not found
```

   I am able to persist my user preferences.