Upgrade google-cloud-cpp to 0.6.0.#5367

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vicroms merged 2 commits intomicrosoft:masterfrom

coryan:upgrade-google-cloud-cpp-0.6.0

Feb 13, 2019

Commits on Feb 7, 2019

Upgrade google-cloud-cpp to 0.6.0.
coryan
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Commits on Feb 12, 2019

Merge branch 'master' of https://github.com/Microsoft/vcpkg into dev/viromer/5367
vicroms
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