cherry-pick of #1073 to release-10.0: Fix python3 hang#1079

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k8s-ci-robot merged 4 commits intokubernetes-client:release-10.0from

fabianvf:fix-py3-hang-10

Feb 21, 2020

Commits on Feb 11, 2020

Merge pull request #1073 from fabianvf/fix-py3-hang

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Commits on Feb 21, 2020

Merge pull request #888 from micw523/update-nginx

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Merge pull request #966 from micw523/testfix116

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Pin pyyaml to compatible major version
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