hystrix pkg don't support fallback func

I want to use hystrix as cb and want to set fallback func once execute failed

You can do this without explicit support in Go kit, can't you?

Yes, I can, but since our Go-Kit supports this function, we'd better support fallback in this function. Let me mention MR, is it ok for you?

Feel free to make a PR but consider it a method of explanation, as I don't yet understand why this is important.

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