map and starmap should log a name based on the original task name

[TauPan]

Checklist

• I have checked the issues list
  for similar or identical enhancement to an existing feature.
• I have checked the pull requests list
  for existing proposed enhancements.
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Related Issues and Possible Duplicates

Related Issues

• None

Possible Duplicates

• None

Brief Summary

If I use task.chunks(...).group() etc. to run tasks, all I see in the logs will be "celery.starmap" and the information about the original task name is completely lost.

I'd like to see e.g. a task name derived on the original one, such as: original_task_name.starmap.

Design

It might be possible to turn the _task_name class attribute into a class property maybe?

Architectural Considerations

I don't know if this might break other parts of celery.

None

Proposed Behavior

I'd like to see e.g. a task name derived on the original one, such as: original_task_name.starmap.

Proposed UI/UX

No change.

Diagrams

N/A

Alternatives

1. Currently one alternative seems to be to override methods and classes in multiple places, see https://gitter.im/celery/celery?at=639b204db9b687534196b04f which is cumbersome, so a direct change in celery core seems cleaner.

2. Maybe a method on the Task and/or Signature classes that can be overridden? That one could trivially return celery.starmap for now in order to remain compatible with existing installations.

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