Add official IPI support to Alibaba Cloud

Goal: 

As an administrator, I would like to deploy OpenShift 4 on Alibaba Cloud leveraging best-practices, installer provisioned infrastructure.

Problem:

Customers would like to be able to easily and quickly deploy OpenShift 4 on other cloud providers rather than being locked into a select few.

Why is this important: 

• This will enable more customers to make the move to OCP 4 by providing deployment support on other popular cloud providers.
• IPI deployment provides a simplified, best-practices OpenShift 4 deployment for customers by leveraging installer provisioned infrastructure objects and nodes enabling faster cluster bring-up time and significantly configurations errors.
• Automated installation process provides the framework for integrating into our CI system.