Much like we currently have *setup* register the variable `module_setup`, we would like other facts-modules register their own namespace. This means that:

 - *network_facts* registers `module_network`
 - *hpilo_facts* registers `module_hw`
 - *vsphere_facts* registers `module_hw`

In retrospect, it would have made more sense to have `setup` register `module_ansible` instead as the setup module uses the `ansible_` namesepace.

Having the `module_` namespace allows us to check whether a certain namespace has already been loaded so we can avoid running the facts module a second time using only_if.

```yaml
 - action: network_facts host=${ansible_hostname_short}
   only_if: is_unset('$module_network')
```