Deploy openpai on the existing kubernetes cluster

[zw39125432]

Organization Name:

Short summary about the issue/question:
How to deploy openpai on the existing kubernetes cluster
Brief what process you are following:

How to reproduce it:

OpenPAI Environment:

• OpenPAI version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Hardware (e.g. core number, memory size, storage size, GPU type etc.):
• Others:

Anything else we need to know:

[fanyangCS]

This is a PR showing how to deploy OpenPAI on an existing k8s cluster using AKS-engine. #4735