Factor subtask launch out of TaskSet.apply(_async) to separate methods. Allows classes derived from TaskSet to customize subtask invocation.
Factor subtask launch out of TaskSet.apply(_async) to separate methods.
Allows classes derived from TaskSet to customize subtask invocation.

WoLpH/celery,WoLpH/celery,cbrepo/celery,cbrepo/celery,frac/celery,ask/celery,ask/celery,frac/celery