Terminate after triggered once ("in" and "at" jobs)

[synFK]

Apart from the name Http_poller, I think it would be more intuitive to stop the plugin after it has been scheduled by an in job or an at job respectively.
For instance if one configures the plugin to run in 1 minute from now (schedule => { "in" => "1m" } the plugin should stop after the request instead of doing nothing forever.
What do you think?