Cleanup API and remove 'experimental' warning (#23000)
Summary:
This fixes ASAN test issues with https://github.com/pytorch/pytorch/pull/21786 seen at https://circleci.com/api/v1.1/project/github/pytorch/pytorch/2212325/output/105/0?file=true and lands it again.
This cleans up the `torch.utils.tensorboard` API to remove all kwargs usage (which isn't clear to the user) and removes the "experimental" warning in prep for our 1.2 release.
We also don't need the additional PyTorch version checks now that we are in the codebase itself.
cc yf225, lanpa, natalialunova
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23000
Reviewed By: sanekmelnikov
Differential Revision: D16349734
Pulled By: orionr
fbshipit-source-id: 604a9cad56868a55e08b509a0c6f42b84f68de95
