Merge pull request #24836 from Clarifai/gpu-impl

Automatic merge from submit-queue

WIP v0 NVIDIA GPU support

```release-note
* Alpha support for scheduling pods on machines with NVIDIA GPUs whose kubelets use the `--experimental-nvidia-gpus` flag, using the alpha.kubernetes.io/nvidia-gpu resource 
```

Implements part of #24071 for  #23587

I am not familiar with the scheduler enough to know what to do with the scores. Mostly punting for now.

Missing items from the implementation plan: limitranger, rkt support, kubectl
support and docs

cc @erictune @davidopp @dchen1107 @vishh @Hui-Zhi @gopinatht

pkg/api/resource_helpers.go

@@ -49,6 +49,13 @@ func (self *ResourceList) Pods() *resource.Quantity {
 	return &resource.Quantity{}
 }
 
+func (self *ResourceList) NvidiaGPU() *resource.Quantity {
+	if val, ok := (*self)[ResourceNvidiaGPU]; ok {
+		return &val
+	}
+	return &resource.Quantity{}
+}
+
 func GetContainerStatus(statuses []ContainerStatus, name string) (ContainerStatus, bool) {
 	for i := range statuses {
 		if statuses[i].Name == name {