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Make artifact downloading more robust for flaky networks (#13984)

* First version

* Add a clarifying comment

* Add verify to ZipDecoder.decodeBytes call

* Review comments

* Need OS Error for missing files

* FileSystemException, not OSError.
J
jcollins-g committed
4d37e03e1d93eb88ed47a43fe5b08a25dca86171
Parent: 9b92c91
Committed by GitHub <noreply@github.com> on 1/9/2018, 6:30:42 PM