Update to catch any errors in loading of cached images into Docker cache in VM which were previously being ignored and leading to unreliable "minikube start" especially in offline mode.

Author: mlgibbons

pkg/minikube/bootstrapper/kubeadm/kubeadm.go

@@ -259,9 +259,12 @@ func NewKubeletConfig(k8s config.KubernetesConfig) (string, error) {
 
 func (k *KubeadmBootstrapper) UpdateCluster(cfg config.KubernetesConfig) error {
 	if cfg.ShouldLoadCachedImages {
-		// Make best effort to load any cached images
-		go machine.LoadImages(k.c, constants.GetKubeadmCachedImages(cfg.KubernetesVersion), constants.ImageCacheDir)
+		err := machine.LoadImages(k.c, constants.GetKubeadmCachedImages(cfg.KubernetesVersion), constants.ImageCacheDir)
+		if err != nil {
+			return errors.Wrap(err, "loading cached images")
+		}
 	}
+
 	kubeadmCfg, err := generateConfig(cfg)
 	if err != nil {
 		return errors.Wrap(err, "generating kubeadm cfg")