Failing Test : TestStartStop/group/embed-certs/serial/VerifyKubernetesImages

[medyagh]

Seems to be side effect of this PR that made dashboard automatically enable metrics

#8842

=== CONT  TestStartStop/group/containerd/serial/VerifyKubernetesImages
start_stop_delete_test.go:227: (dbg) Done: ./minikube-linux-amd64 ssh -p containerd-20200727195440-11082 "sudo crictl images -o json": (1.671216435s)
start_stop_delete_test.go:227: Found non-minikube image: kindest/kindnetd:0.5.4
start_stop_delete_test.go:227: Found non-minikube image: library/busybox:1.28.4-glibc
start_stop_delete_test.go:227: v1.18.3 images mismatch (-want +got):
  []string{
  	... // 5 identical elements
  	"k8s.gcr.io/kube-proxy:v1.18.3",
  	"k8s.gcr.io/kube-scheduler:v1.18.3",
+ 	"k8s.gcr.io/metrics-server-amd64:v0.2.1",
  	"k8s.gcr.io/pause:3.2",
  	"kubernetesui/dashboard:v2.0.1",
  	"kubernetesui/metrics-scraper:v1.0.4",
  }