verbose code generation in e2e test

Author: estroz

test/e2e/memcached_test.go

@@ -153,11 +153,14 @@ func TestMemcached(t *testing.T) {
 	// 	t.Fatalf("Could not write deploy/operator.yaml: %v", err)
 	// }
 
-	cmdOut, err = exec.Command("operator-sdk",
+	cmd := exec.Command("operator-sdk",
 		"add",
 		"api",
 		"--api-version=cache.example.com/v1alpha1",
-		"--kind=Memcached").CombinedOutput()
+		"--kind=Memcached")
+	// Generators will print errors if -v is set.
+	cmd.Env = append(os.Environ(), projutil.GoFlagsEnv+`="-v"`)
+	cmdOut, err = cmd.CombinedOutput()
 	if err != nil {
 		t.Fatalf("Error: %v\nCommand Output: %s\n", err, string(cmdOut))
 	}