Added functionality and API for pod autoscaling based on container resources
Added functionality and API for pod autoscaling based on container resources

Signed-off-by: Arjun Naik <anaik@redhat.com>

Kubernetes-commit: 0fec7b0f7e2dfd4b0c6c57e086472546f6c69efa

kubernetes/apiextensions-apiserver,kubernetes/apiextensions-apiserver