winbind idmap plugin: update struct idmap_domain to latest version
    
    While updating to interface version 6 we forgot to add the query_user
    member.
    
    Recent version of Samba added a new member dom_sid. Unfortunately the
    interface version was not update for this change so we have to enable
    the member based on the Samba version.
    
    Related to https://pagure.io/SSSD/sssd/issue/4005
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>