Allow shutdown_delay to execute regardless of service registration

[drewbailey]

Issue

Currently a task's shutdown_delay as well as the task group's shutdown delay will only run if there are registered services for the task or group.

This implementation detail isn't called out anywhere in the documentation and the way that its configured, by setting shutdown_delay outside of the service block makes it unclear that shutdown_delay is dependent on a service.

Original report: #7251

[djenriquez]

@drewbailey -- Just to clarify, if we use network namespaces, and subsequently group level service definitions, then only the group level shutdown_delay will go into effect. The task's shutdown_delay will be ignored since there is no service defined at that level.

Is this a true statement?

[drewbailey]

Hey @djenriquez, that is correct. Currently a task needs to have a service defined in order for a task shutdown_delay to be evaluated or even created here. The service hooks preKilling method is what invokes shutdown_delay

[djenriquez]

Understood, thank you for the very prompt response!

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