SUDO: Use the override_space option
    
    https://fedorahosted.org/sssd/ticket/2397
    
    With this path, a user whose name is "space user" would match a sudo
    rule while using the override_default_space option. Please note that the
    option is only a client-side override, so the sudoUser attribute must
    contain the space in order to match the original name. In other words,
    when substituting space ( ) for underscore (_), this attribute would match:
        sudoUser: space user
    this would not:
        sudoUser: space_user
    
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>
    Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>