Use Object in round-trip conformance test
Use Object in round-trip conformance test

Summary: Currently we assume roundtrip request and response always hold `Value` in `Any` data. This assumption isn't always correct (otherwise we should not use `Any`). This diff changed to parse the Any data to `Object` and compare.

Reviewed By: iahs

Differential Revision: D35369638

fbshipit-source-id: 9710dbe68d456029d7cadf06d4c3015723266efa

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