RDMA/nldev: Allow IB device rename through RDMA netlink

Provide an option to rename IB device name through RDMA netlink and
limit it to users with ADMIN capability only.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>