Sagemaker-mxnet-training

Features

* support mxnet 1.7.0

Bug Fixes and Other Changes

* drop py27, add py38 support

Bug Fixes and Other Changes

* remove the openssh addition

Documentation Changes

* update test readme

Testing and Release Infrastructure

* add issue templates

Features

* Add MPI support for distributed training in MXNet

Bug Fixes and Other Changes

* bump version of sagemaker-training for script entry point fix

Documentation Changes

* remove confusing information from the Readme.

Testing and Release Infrastructure

* Rename buildspec files.