From https://github.com/SSSD/sssd/issues/8175 :

```
This has been deprecated for several years with https://github.com/SSSD/sssd/commit/4b8f260c97b3164fbfccf185e14752ac17c532ac and causes confusion as mentioned here https://github.com/SSSD/sssd/issues/8134

`ifp_user_get_groups_send()` calls `ifp_user_get_attr_send()` therefore this needs to be changed (`ifp_users_user_get_groups()` instead??)  to remove all infopipe getuserattr() related functions

I checked `cockpit` project and also `ipa-tuura` project and both use the correct `org.freedesktop.sssd.infopipe.Users` infopipe interface
```

UPDATE: 'mod_lookup_identity' uses deprecated `GetUserAttr`, so we can't remove this in SSSD without update of `mod_lookup_identity` (and this is problematic).