Don't require the kubeconfigs and certs to not exist; that's now handled in…

cmd/kubeadm/app/phases/certs/pkiutil/pki_helpers_test.go

@@ -74,6 +74,7 @@ func TestNewCertAndKey(t *testing.T) {
 		config := certutil.Config{
 			CommonName:   "test",
 			Organization: []string{"test"},
+			Usages:       []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
 		}
 		_, _, actual := NewCertAndKey(caCert, caKey, config)
 		if (actual == nil) != rt.expected {

cmd/kubeadm/app/preflight/checks.go

@@ -319,10 +319,7 @@ func RunInitMasterChecks(cfg *kubeadmapi.MasterConfiguration) error {
 		PortOpenCheck{port: 10252},
 		HTTPProxyCheck{Proto: "https", Host: cfg.API.AdvertiseAddresses[0], Port: int(cfg.API.Port)},
 		DirAvailableCheck{Path: path.Join(kubeadmapi.GlobalEnvParams.KubernetesDir, "manifests")},
-		DirAvailableCheck{Path: kubeadmapi.GlobalEnvParams.HostPKIPath},
 		DirAvailableCheck{Path: "/var/lib/kubelet"},
-		FileAvailableCheck{Path: path.Join(kubeadmapi.GlobalEnvParams.KubernetesDir, kubeconfig.AdminKubeConfigFileName)},
-		FileAvailableCheck{Path: path.Join(kubeadmapi.GlobalEnvParams.KubernetesDir, kubeconfig.KubeletKubeConfigFileName)},
 		FileContentCheck{Path: bridgenf, Content: []byte{'1'}},
 		InPathCheck{executable: "ip", mandatory: true},
 		InPathCheck{executable: "iptables", mandatory: true},