Adds string accepting seed function and more control of logging and seeding

[johncowen]

This PR does a number of things:

1. Adds some new environment variables to enable toggling of logging, faker locales, and controlling the faker seed.
2. The new faker upgrade came with a few deprecation warnings, so we work around those for the moment to avoid having to search/replace an entire API double codebase.
3. Adds a seed function, which is now available in API doubles, that can be used for setting the seed either permanently for the request or temporarily. This seed function also accepts strings (which are converted to a numeric faker seed) to enable relationships across multiple API requests whilst keeping the entire API double stateless.

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