[18.09 backport] Update to Golang 1.12.6#2409

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euanh merged 4 commits into

moby:bump_18.09from

thaJeztah:18.09_backport_golang_1.12.6

Jul 1, 2019

Commits on Jun 27, 2019

vet: Fix composite literal uses unkeyed fields warnings

euanh
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thaJeztah
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vet: Fix format string warnings

euanh
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thaJeztah
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gofmt: Fix formatting warnings

euanh
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thaJeztah
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Dockerfile: Update to Go 1.12.6, matching moby/moby

euanh
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thaJeztah
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