[Distutils] problems with sdist upload since CDN update

[kiorky]

I got some random releasing (1 on 5 or 6 tries) problems since last pypi update.
For example, with collective.ckeditor (3.6.10 tag on github), the sdist upload
will randomly not upload the file without reporting any error on console:


https://github.com/collective/collective.ckeditor/tree/3.6.10

-- 
Cordialement,
KiOrKY
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