[Samba] Reloading smbd session process group membership cache

[Jeremy Allison]

On Fri, Feb 22, 2019 at 06:11:31PM +0100, Eugene Pankov via samba wrote:
> Credentials are not changed - UID/GID/SID are still the same afterwards.
> The user is simply being added to another group.

Group membership comes under my definition of credentials
as they gate access to resources.

We can't change credentials on an existing connection,
disconnect and allow the client to reconnect.