Fix (#2) ppc64le build break on git status --porcelain check (#16852)
Summary:
Add test/.hypothesis/ to .gitignore to pass git status --porcelain check in CI build
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16852
Differential Revision: D14000206
Pulled By: soumith
fbshipit-source-id: 5da99a4bb242c12aa35776f7254f6399a7fa6d8c
