Pin docker-ce version to the one expected by nvidia-docker2 (#16976)
Summary:
Fix errors such as https://circleci.com/gh/pytorch/pytorch/760715.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16976
Differential Revision: D14030665
Pulled By: yf225
fbshipit-source-id: dece6a5aa4d13ff771c18b4ce02a0b9f9572a379
