Bumping k8s dependencies to 1.13

vendor/golang.org/x/net/http2/flow_test.go

@@ -49,5 +49,39 @@ func TestFlowAdd(t *testing.T) {
 	if f.add(1) {
 		t.Fatal("adding 1 to max shouldn't be allowed")
 	}
+}
+
+func TestFlowAddOverflow(t *testing.T) {
+	var f flow
+	if !f.add(0) {
+		t.Fatal("failed to add 0")
+	}
+	if !f.add(-1) {
+		t.Fatal("failed to add -1")
+	}
+	if !f.add(0) {
+		t.Fatal("failed to add 0")
+	}
+	if !f.add(1) {
+		t.Fatal("failed to add 1")
+	}
+	if !f.add(1) {
+		t.Fatal("failed to add 1")
+	}
+	if !f.add(0) {
+		t.Fatal("failed to add 0")
+	}
+	if !f.add(-3) {
+		t.Fatal("failed to add -3")
+	}
+	if got, want := f.available(), int32(-2); got != want {
+		t.Fatalf("size = %d; want %d", got, want)
+	}
+	if !f.add(1<<31 - 1) {
+		t.Fatal("failed to add 2^31-1")
+	}
+	if got, want := f.available(), int32(1+-3+(1<<31-1)); got != want {
+		t.Fatalf("size = %d; want %d", got, want)
+	}
 
 }