Remove reference to deprecated allow-privileged flag for kubelet

[rptaylor]

The --allow-privileged flag does not exist for kubelet:
https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/

It was removed: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.15.md#node

However I still don't understand why privileged pods are only required if a daemonset is used. How else can the plugin be deployed besides a daemonset, and how does it work when it is unprivileged?

This also fixes some minor language issues.

[rptaylor]

Or does it really mean that privileged mode is only required when health checks are run by the daemonset?

[y2kenny]

Thanks for the clean up @rptaylor, it is much appreciated. I wrote this long time ago and I probably had the impression (likely incorrect) that privileged container for daemonset is somehow different from privileged container in a regular pod.

And yes, I meant to say privileged mode is needed with health check because of this:
https://github.com/ROCm/k8s-device-plugin/blob/master/cmd/k8s-device-plugin/main.go#L104

The device plugin (without health check) usually doesn't need to be privileged because it just does the allocation without accessing the hw itself. I might need to rethink how I do health check.

I would be happy to merge this as is or if you want to further rephrase base on what I wrote here I would be happy to wait as well. Please let me know.

[rptaylor]

@y2kenny Updated, ready to go.
Could you also have a look at #29 (comment) and #57 if you get a chance? Thanks!