Execute action only if specified file using param removes exist (execute reverse control of creates).

Some usage eg.:

```yaml
- name: enable apache2 default websites
  action: command /usr/sbin/a2ensite $item
creates=/etc/apache2/sites-enabled/$item
  with_items:
    - default
    - default-ssl

- name: disable apache2 default websites
  action: command /usr/sbin/a2dissite $item
removes=/etc/apache2/sites-enabled/$item
  with_items:
    - default
    - default-ssl
```