agent: Skip 'not-authorized' check when running as root

Since root bypasses unix priveleges all together.

Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>
tap-gtester: If test says it's skipped ignore results

This is a change from the gnome-keyring project.

Reviewed-by: Marius Vollmer <marius.vollmer@redhat.com>