[MERGE] Fix NotImplementedError spam from do_body, add test_smart_request module.

[Andrew Bennetts]

I noticed while looking at some test failures that SmartServerRequest's default
NotImplementedError for do_body was causing a lot of noise in the logs.
Harmless noise, but the tracebacks obscure the interesting bits.  So this patch
fixes that, and adds some tests.

-Andrew.

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