[To be discarded]collect aws cloudformation templates and stacks at Amazon refreshing

This is a sub PR for Support Amazon CloudFormation and OpenStack Heat (issue #523). See there for the design document. The following is the model relations.

![orchestration](https://cloud.githubusercontent.com/assets/7047579/4449190/2e6998c8-481a-11e4-9ef4-5837ab7d99d9.png)