[BUGFIX] Cluster-CLI: Default to non privileged group

[mfontana-elem]

https://github.com/oracle-quickstart/oci-hpc/issues/46

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[mfontana-elem]

Well, I am not going to go through legal at my company to contribute a fix as silly as this.

You can ignore this PR. The description in the Issue should suffice for fixing this.

[arnaudfroidmont]

The default group is intended to work as is. GID 9876 can have sudo priviledge or not in the stack.