Updates January'2020 DLC release

• Simplified dependencies, removed aioboto3 and unpinned boto3 version
• Fixed Horovod training support
• Fixed numeration of steps in saved data
• Removed saving of input_loss as irrelevant
• Changed default save_interval from 100 steps to 500 steps
• Improved examples and documentation

Updated smdebug's dependency on boto libraries

This release is primarily to change the dependency of smdebug on boto3 and botocore libraries. smdebug now depends on the versions of these libraries released for re:Invent 2019. boto3>=1.10.32 and botocore>=1.14.32

Apart from this, there are some doc changes, and indentation change for the sagemaker metrics bug fix from the previous release.

First release on PyPI

• Fixed bug in export of SageMaker metrics
• Updated licenses and third-party licenses

Released to DLC on 11/27

Renamed trial.tensors() to tensor_names()
Renamed Hook.hook_from_config() to Hook.create_from_json_file()
Changed collection file load logic to also check for training end
Change searchable flag in save_scalar to sm_metric
Disallow regex and collection to be passed simultaneously for tensor_names() method