Remove usage of the word "Whitelist"

[JBallin]

Whitelist is a potentially offensive word.

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example. - NA
• Have you successfully run brew style with your changes locally? - NA
• Have you successfully run brew tests with your changes locally? - NA

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[reitermarkus]

Thanks, @JBallin!