Fixes #5589: Generate an Apache 2.4 compatible rudder-networks-24.conf f...

...ile

Ticket: http://www.rudder-project.org/redmine/issues/5589

To be merged in 2.11
It is expected: this 127.0... generate duplicates in the final file, like this:
```
Allow from 127.0.0.0/8 <= This shouldn't be here !
Allow from ::1
Allow from 127.0.0.1
Allow from 192.168.42.0/24
```