man: List alternative schema defaults for LDAP AutoFS parameters
    
    ldap_autofs_map_name and ldap_autofs_entry_key have their rfc2307bis defaults
    listed alongside the rfc2307 defaults.
    
    ldap_autofs_entry_object_class has a fixed description and default
    
    This patch replaces the other one I posted, implementing the alternative schema
    defaults Jakub suggested.
    
    Regards,
    Robin McCorkell
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>