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This class handles the multiprocessing requirements of Ansible by
creating a pool of worker forks, a result handler fork, and a
manager object with shared datastructures/queues for coordinating
work between all processes.
The queue manager is responsible for loading the play strategy plugin,
which dispatches the Play's tasks to hosts.
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Loads all available callbacks, with the exception of those which
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Iterates over the roles/tasks in a play, using the given (or default)
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