Need to abstract GetClusterStatus to be part of the controller plugin

[MrHohn]

The ultimate goal of this autoscaler is to support any types of cluster statuses for controllers. In current implementation, only cluster size(node number and core number) is consider as part of the cluster size. Soon it will become not sufficient because cluster size is not always an appropriate parameters for scaling applications.

Another obvious option for scaling is pods number with QPS per pod. Or even metrics retrieved from some other applications in the same cluster. To support any possible type for cluster status, I think abstracting GetClusterStatus() also into controller would be a good choice.

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

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