Readypod optimization in executor (#1860)

A ready pod which can be specialized was fetched for every function earlier, this has been changed to a queue and cache implementation in client-go to improve performance.

pkg/utils/utils.go

@@ -66,15 +66,6 @@ func IsReadyPod(pod *apiv1.Pod) bool {
 		return false
 	}
 
-	// pod is not in Running Phase. It can be in Pending,
-	// Succeeded, Failed, Unknown. In some cases the pod can be in
-	// different sate than Running, for example Kubernetes sets a
-	// pod to Termination while k8s waits for the grace period of
-	// the pod, even if all the containers are in Ready state.
-	if pod.Status.Phase != apiv1.PodRunning {
-		return false
-	}
-
 	// pod is in "Terminating" status if deletionTimestamp is not nil
 	// https://github.com/kubernetes/kubernetes/issues/61376
 	if pod.ObjectMeta.DeletionTimestamp != nil {