Update attributes to match the canonical attribute list.#232

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qiwzhang merged 2 commits intoistio:masterfrom

ZackButcher:attributes

Apr 7, 2017

Commits on Apr 7, 2017

Update response.http.code to response.code and response.latency to response.duration to line up with the canonical attributes in istio/istio.github.io/docs/concepts/attributes.md
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Format according to clang-format
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