all: replace fmt.Sprintf("%d") with strconv.Itoa

[catenacyber]

This was found by running git grep 'fmt.Sprintf("%d",' | grep -v test | grep -v vendor

And this was automatically fixed with gotiti https://github.com/catenacyber/gotiti
and using unconvert https://github.com/mdempsky/unconvert
to check if there was (tool which fixed another useless cast)

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Message from Ian Lance Taylor:

Patch Set 1:

(4 comments)

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Patch Set 2:

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Patch Set 3:

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Patch Set 3:

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Patch Set 3:

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Patch Set 4:

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Patch Set 4:

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Patch Set 4:

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Message from Ian Lance Taylor:

Patch Set 5: Run-TryBot+1

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Patch Set 5:

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Patch Set 5: TryBot-Result+1

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Patch Set 5: Auto-Submit+1 Code-Review+2 Run-TryBot+1

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Patch Set 5:

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Patch Set 5:

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Patch Set 5:

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Patch Set 5: Code-Review+1

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This PR is being closed because golang.org/cl/477675 has been merged.