Let's create per-run timeout for astute task

[Stanislaw Bogatkin]

Today our tasks looks like

parameters:
    cmd: some_cmd
    retries: 10
    interval: 30
    timeout: 180

It means that if cmd returns (for example) 1 as exit code 5 seconds after it ran, it will be restarted after 30 secs again. After 180 secs of such retries task will be stopped.
When solving https://bugs.launchpad.net/fuel/+bug/1533082 we got a problem that cmd in the task itself can hang, so it won't return any exit code at all. In this case task will marked as failed after 180 secs and deployment will be broken.

There is a workaround for this - wrap program in timeout, but it will be much nicer to have such parameter in task itself to ensure that task will be killed and restarted forcibly if it hangs.