NEGCACHE: Always add "root" to the negative cache
The current code only adds "root" to the negative cache in case there's
any other user or group set up in to be added.
As SSSD doesn't handle "root", it should *always* be added to the
negative cache.
Related: https://pagure.io/SSSD/sssd/issue/3460
Signed-off-by: Fabiano FidĂȘncio <fidencio@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
(cherry picked from commit 1e7b7da3aa56060c26f8ba1c08318cdee77753ea)