emit TaskEvent for task stops blocked by shutdown_delay

[tgross]

When a task shuts down with a shutdown_delay set, there's no Task Event that indicates we're waiting for the task to shut down. It can be useful for debugging what would otherwise look like a "stuck" task to have this in the output of nomad alloc status (and the corresponding pages on the UI).

We've already got a debug-level log entry at the right spot in task_runner.go#L931, so it would be a matter of creating a new Task Event and calling UpdateState for it (similar to task_runner.go#L1143-L1145).

[DarthBenro008]

Hi @tgross , I'd be happy to send a PR for the same, thanks for the detailed description! :D

[cesarvspr]

@DarthBenro008 I would be happy to assist if needed, please share your PR with us

[DarthBenro008]

@cesarvspr I have raised a PR!

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