LU-17961 sec: add server_upcall rbac role

LU-17961 sec: add server_upcall rbac role

The purpose of the new server_upcall rbac role is to control whether
clients use the server side defined identity upcall. When set, clients
do comply with the server side identity upcall. When not set, clients
are leveraging the special INTERNAL identity upcall, which means
servers trust supplementary groups as provided by the clients.

Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I01dcedad5da0e175aa7b8d187f2affd34d933e39
Was-Change-Id: I39a69904ce4709eacf6f08173d3cfe42e247b5bd
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55475
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>