The clim `preferred_username` is optional in Azure AD. Although is listed as preferred, in some enterprise environment it's not possible to add this additional claim. `unique_name` and `upn` are legacy alternatives

* Change ownership not working for key.pem
* Fix Keycloak not importing realm, default path of keycloak to /auth
* Set default path of keycloak to /auth

If using the filesystem storage provider
for session store it can be set than a larger value than 4kb
as it is not tied to the restriction of a cookie anymore.

Some clarifications