Rather than mutating the `OPTION_VALUES` global state here, would it be possible to pass it to each object that needs it?

Specifically, a mere 2 lines below, you're constructing all the relevant application components as individual instances; `MimicPresetApi`, `AuthApi`, `NovaApi`, and `LoadBalancerApi`.  Each one of those wants to know about its URL location, and perhaps `AuthApi` wants to know about the location of everything else.  Just passing it in would make this much more straightforward.