Merge branch 'nginx-1.17.3' into 'master'

Build for 1.17.3

See merge request !5
7 jobs for master in 2 minutes and 41 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Build
passed build-deb:buster #4923

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passed build-deb:jessie #4921

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passed build-deb:stretch #4922

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  Test
passed test-deb:buster #4926

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passed test-deb:jessie #4924

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passed test-deb:stretch #4925

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  Deploy
passed aptly #4927

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