Updates to check-megaraid-sas-status.rb

[jdito]

Pull Request Checklist

Is this in reference to an existing issue?
no

General

• Update Changelog following the conventions laid out on Keep A Changelog

Purpose

Needed to be able to run with an unprivileged user in my environment. Flag defaults to false to prevent breaking existing configs. Please let me know if there's any other information needed.

[eheydrick]

I think a better option would be to run the whole check under sudo. That would offer more flexibility on sudo options, the path to sudo itself, etc. Good catch on the typo, I fixed it in master.