Update ROCm CI to python3.6 (#22322)
Summary:
Given that python 2.7 will be EOL'd on Jan 1, 2020 and we have models depending on python3.5+, we'd like to update the ROCm CI across the board to python3.6.
This PR adds the skip tests and some semantic changes for PyTorch.
Open tasks/questions:
* RoiAlignTest.CheckCPUGPUEqual fails in the Caffe2 unit tests. Is this something expects / can be skipped?
* for testing, I've used update-alternatives on CentOS/Ubuntu to select python == python 3.6. Is this the preferred way?
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22322
Differential Revision: D16199862
Pulled By: ezyang
fbshipit-source-id: 46ca6029a232f7d23f3fdb5efc33ae39a379fca8
