Cluster autoscaler tests

This repo is home to a test suite extracted from the Kubernetes e2e suite. These tests were very coupled to running only on GCE/GKE, and the intention here was to create a staging ground for making them more platform agnostic.

In order to allow platform providers to implement the Provider interface without needing all of them to live in one shared repository, the tests are setup as a function that can be invoked from a separate test binary. An example of this can be found in the CAPI autoscaler repo. This repository is meant to solely be a test library, and the actual executable tests that import this library are meant to live outside of this repo.