Provide standard deep learning docker images

[hzy46]

We use docker images from deepo as the default images in OpenPAI. It is okay for basic needs. However, deepo suffers from the following problems:

• The version of the deep learning framework, such as TensorFlow and PyTorch, is not fixed even with the same tag.
• Lacks some basic functions, such as SSH and Jupyter Notebook.

To enhance the user experience, we could build the following docker images:

• Python 3
• TensorFlow/PyTorch/MXNet/CNTK, tagged by version.
• With/Without GPU support.
• With SSH and Jupyter Notebook support.

[mydmdm]

refer to the documentation here
https://openpai.readthedocs.io/en/latest/manual/cluster-user/docker-images-and-job-examples.html