maint: handle face clear/reset sanely in the interface spec.

We used to flush the loaded face cache, but not the list of 'require' things,
which meant that these tests couldn't work with anything outside their own
setup, which is actually pretty undesirable.

Instead, port the code from the face_collection spec that handles this in a
way that makes me less inclined to weep, and which lets the surrounding code
work as designed.

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