Do not mutate SCC - use RBAC access to it on OpenShift

[duritong]

From OpenShift 4.4 on the built-in SCCs will be managed and thus you cannot any longer mutate them by adding user. The proper way is either to copy an existing SCC or use RBAC to access them.

This updates the documentation for the RBAC approach.

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[kmova]

Hi @duritong, We are in the middle of migrating the NFS client code into a new home under https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner. The migration PR is up for review at the moment. https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/pull/2

Pulled in the changes from this commit into the migration PR here. https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/pull/2/commits/92508da2ff6f629c0467239762b7c8ccce099dc3

Could you please help with reviewing it?

[nikhita]

As @kmova mentioned, we are in the process of archiving this repo and continuing work in https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner. Looks like your changes got pulled into the migration PR https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/pull/2. If you could help in reviewing the PR, that'd be great! :)

Going to close this PR in order to be able to archive this repo.