Develop a functional test suite

[evan2645]

We want to make sure that the container builds and the driver works as expected on a regular basis. We also want to be sure that it is working with the currently supported versions of Kubernetes.

I am not sure the best way to accomplish this. I found this blog post about using a utility to test CSI drivers. At a minimum, the test should ensure that the container can launch and perform the intended function.

[azdagron]

We've had integration tests for a while. Recently merged #19 which expands the test suite to test many K8s versions.