Adapted functional tensor tests on CPU/CUDA (pytorch#2569)

* Adapted almost all functional tensor tests on CPU/CUDA
- fixed bug with transforms using generated grid
- remains *_crop, blocked by pytorch#2568
- TODO: test_adjustments

* Apply suggestions from code review

Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

* Fixed issues according to review

* Split tests into two: cpu and cuda

* Updated test_adjustments to run on CPU and CUDA

Co-authored-by: Francisco Massa <fvsmassa@gmail.com>