title: Access parent form validation in child component Angular 5 control value accessor
body: <p>I referred this link : <a href="http://tylerscode.com/2017/03/splitting-angular-forms-controlvalueaccessor/#respond" rel="nofollow noreferrer">http://tylerscode.com/2017/03/splitting-angular-forms-controlvalueaccessor/#respond</a></p>
  
  <p>I want to validate all fields in child component with control value accessor and template driven forms.</p>
  
  <p>(This is link of issues on Stackblitz: <a href="https://stackblitz.com/edit/angular-qzioet" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-qzioet</a>)</p>