Take initContainer's GPU quota into consideration

[kerthcet]

What would you like to be added:

Currently when calculating pod GPU resources, we just consider the spec.Containers but the spec.InitContainers, actually we should.

func GetGPUResourceOfPod(pod *v1.Pod) uint {
	var mem uint
	for _, container := range pod.Spec.Containers {
		mem += getGPUResourceOfContainer(&container)
	}
	return mem
}

So the value should be
Max(max(initContainers), sum(Containers))

Why is this needed:

[kerthcet]

/assign