pihole - disable with custom time

[devmatteini]

Right now pihole::disable disable the pihole server indefinitely, but it's possibile to tell the server for how much time we want it to be disabled.

API

The new api should look like pihole::disable(config: &PiHoleConfig, time: Option<?>).
When the time is None the pihole will be disabled indefinitely.

The time passed to the request must be converted to seconds as the pihole API says.

CLI

Command::Disable must have a new optional flag -t, --time which can be used to set the time.