test: don't run ng5 factory test on ng2/4

Author: filipesilva

tests/e2e/tests/build/rebuild-ngfactories.ts

@@ -18,6 +18,11 @@ export default function () {
     return Promise.resolve();
   }
 
+  // Skip this test in Angular 2/4.
+  if (getGlobalVariable('argv').ng2 || getGlobalVariable('argv').ng4) {
+    return Promise.resolve();
+  }
+
   return execAndWaitForOutputToMatch('ng', ['serve', '--aot'], validBundleRegEx)
     .then(() => writeMultipleFiles({
       'src/app/app.component.css': `