Removing CUDA 8.0 nightlies (#20068)
Summary:
Resolves https://github.com/pytorch/pytorch/issues/20067
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20068
Differential Revision: D15184571
Pulled By: pjh5
fbshipit-source-id: a37846a23ac7b414f9a3741f37a2db5bb61c93a9
