Merge remote-tracking branch 'origin/master' into release-1.10

Author: caleb miles

cmd/kubeadm/app/apis/kubeadm/v1alpha1/defaults.go

@@ -38,7 +38,7 @@ const (
 	// DefaultClusterDNSIP defines default DNS IP
 	DefaultClusterDNSIP = "10.96.0.10"
 	// DefaultKubernetesVersion defines default kubernetes version
-	DefaultKubernetesVersion = "stable-1.9"
+	DefaultKubernetesVersion = "stable-1.10"
 	// DefaultAPIBindPort defines default API port
 	DefaultAPIBindPort = 6443
 	// DefaultAuthorizationModes defines default authorization modes