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Improve global visibility on the run_squad script, remove unused files and fixes related to XLNet.

When evaluating, shouldn't we always use the SequentialSampler instead of DistributedSampler? Evaluation only runs on 1 GPU no matter what, so if you use the DistributedSampler with N GPUs, I think you'll only evaluate on 1/N of the evaluation set. That's at least what I'm finding when I run an older/modified version of this repo.

Add a speed estimate log (time per example)
for evaluation to examples/run_squad.py