Swap CUDA-10.2 and CUDA-11.1 master-only status (#57207)
Summary:
CUDA-11.1 build and tests will now run on PR and master, but 10.2 will
be master only
Also, delete remaining CUDA-10.1 build
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57207
Reviewed By: ngimel
Differential Revision: D28077271
Pulled By: malfet
fbshipit-source-id: 633945bf85091575efa34280e04a6b9d68a53138