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Also merged in some changed from apex

The LICENSE file says everything is 3-clause BSD, which is what we want,
but at some point the Apache license was added to the top of some files
and that proliferated. This commit removes the Apache license from any
files that we own the copyright to.

Also updates the copyright year and removes the unnessary coding=utf-8
line.

Remove deprecated destination argument to state_dict functions and make all arguments keyword to avoid warnings.

Add the option for fp32 residual connection (fp32 residual connection machinery still needs to be added)

Small bugfix in bert_model.py: make sure word_embeddings is initialized before instantiating lm_head

Also includes following changes for inter-layer model-parallel implementation:
- Refactoring of model implementations
- Training loop changes to support inter-layer communication using `ring_exchange`
- New groups for inter-layer communication
- Checkpoint changes
- Command line arguments

Signed-off-by: Boris Fomitchev <bfomitchev@nvidia.com>

Signed-off-by: Boris Fomitchev <bfomitchev@nvidia.com>