NSS: Don't error out when deleting an entry which has id = 0 from the memcache
This code path can be easily triggered by calling `id 0` after applying
the previous patch in this series and SSSD should not error out in this
case.
As SSSD doesn't handle "root", this entry never will be part of the
memcache and EOK can be safely returned there.
Related: https://pagure.io/SSSD/sssd/issue/3460
Signed-off-by: Fabiano FidĂȘncio <fidencio@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>