silence "Can not convert group sid" warnings in the log

silence "Can not convert group sid" warnings in the log

Forwarded: https://gitlab.com/samba-team/samba/-/merge_requests/3872

/var/log/samba/log.winbind is full of messages like:

[2024/02/09 06:25:04.788182,  1, pid=74620] source3/winbindd/winbindd_getgroups.c:259(winbindd_getgroups_recv)
  Could not convert sid S-0-0: NT_STATUS_NONE_MAPPED

On a busy server these are logged several 1000s times per minute,
making any other messages basically invisible.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Gbp-Pq: Name silence-can-not-convert-group-sid.diff