Cron scheduling: default seconds to 0

[svensp]

Cron documentation correctly states that all options not given will be set to * however it also lists

{
'hour' => 2,
'minute' => 30,
}

as running at 2:30 where it would actually run at 2:30:01, 2:30:02, 2:30:03... 2:30:59 (unless the container takes more than a minute to run)

Proposed solution:
Set seconds default value to 0

[svensp]

Thoughts? This would break backwards compatibility if someone actually wants it to run their container every second of the given time.
I think this use case it more likely to be an accident thought

[justb81]

Set seconds default value to 0

in respect to the other options this should be second.