Sync sphinx dependency with global requirements. It caps python 2 since sphinx 2.0 no longer supports Python 2.7.
Change abandoned by jacky06 (zhang.min@99cloud.net) on branch: master Review: https://review.opendev.org/662902
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Change abandoned by jacky06 (zhang. min@99cloud. net) on branch: master /review. opendev. org/662902
Review: https:/