SYSDB_OPS: Error out on id-collision when adding an incomplete group
This situation can be hit when renaming a group. For now, let's just
error this out so the caller can handle it properly on its own layer.
Related:
https://pagure.io/SSSD/sssd/issue/2653
Signed-off-by: Fabiano FidĂȘncio <fidencio@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>