Implement noopWindowsResourceAllocator

On Windows, the podAdmitHandler returned by the GetAllocateResourcesPodAdmitHandler() func
and registered by the Kubelet is nil.

We implement a noopWindowsResourceAllocator that would admit any pod for Windows in order
to be consistent with the original implementation.

Author: adelina-t

pkg/kubelet/cm/container_manager_windows.go

@@ -54,6 +54,14 @@ type containerManagerImpl struct {
 	nodeConfig NodeConfig
 }
 
+type noopWindowsResourceAllocator struct{}
+
+func (ra *noopWindowsResourceAllocator) Admit(attrs *lifecycle.PodAdmitAttributes) lifecycle.PodAdmitResult {
+	return lifecycle.PodAdmitResult{
+		Admit: true,
+	}
+}
+
 func (cm *containerManagerImpl) Start(node *v1.Node,
 	activePods ActivePodsFunc,
 	sourcesReady config.SourcesReady,
@@ -178,7 +186,7 @@ func (cm *containerManagerImpl) ShouldResetExtendedResourceCapacity() bool {
 }
 
 func (cm *containerManagerImpl) GetAllocateResourcesPodAdmitHandler() lifecycle.PodAdmitHandler {
-	return nil
+	return &noopWindowsResourceAllocator{}
 }
 
 func (cm *containerManagerImpl) UpdateAllocatedDevices() {