Add retry when uploading sources to koji

[Zlopez]

The koji uploadWrapper sometimes fails with GenericError, let's retry the upload if this happens.

Fixes #557

[softwarefactory-project-zuul[bot]]

Build succeeded. https://fedora.softwarefactory-project.io/zuul/buildset/ea2bb052c8d948888c2bf44e816993f3

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