Create /var/lib/etcd with 0700

If we let the hostpath with DirectoryOrCreate to create this directory
it defaults to 0755. A default install should use 0700 for better
security especially if the directory is not present.

Change-Id: Idc0266685895767b0d1c5710c8a4fb704805652f

cmd/kubeadm/app/phases/etcd/local_test.go

@@ -67,7 +67,7 @@ func TestCreateLocalEtcdStaticPodManifestFile(t *testing.T) {
 					KubernetesVersion: "v1.7.0",
 					Etcd: kubeadmapi.Etcd{
 						Local: &kubeadmapi.LocalEtcd{
-							DataDir: "/var/lib/etcd",
+							DataDir: tmpdir + "/etcd",
 						},
 					},
 				},