'Latest Container Image' Function

[nargokul]

Issue #, if available:

Description of changes:

This utilities function will take in the framework name , validate it and fetch the latest container image for that framework.
Aim of this is so that users need not update their code every time a new image is generated.

Testing done:

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[benieric]

Does this work with all framework type or just subset? Can it work if user wants to get latest for distributed training as well or this meant to just be like very simple for few framework

[nargokul]

Yeah this needs some rework since some of them require instance type and python versions . Will update that .

Can you point me to some config jsons that are specifically for distributed training ?