Update jenkins caffe2 scripts for ROCm circleci images. (#39908)
Summary:
Remove work-around to install conda locally for older ROCm jenkins images.
Remove use of sudo to install pip packages.
Install missing packages for caffe2 test.sh needs on ROCm.
CC ezyang xw285cornell sunway513
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39908
Differential Revision: D22044404
Pulled By: ezyang
fbshipit-source-id: da6b5a45dcf68432339ad6f1c4af2d8a96df73f1
