Add a configuration option that prevents puma from queueing requests. #640
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Issue #612
This adds a configuration option queue_requests
With queue_requests set to true (the default), workers accept all
requests and queue them before passing them to the handlers.
With it set to false, each worker process accepts exactly as
many requests as it is configured to simultaneously handle.
In combination with threads 1, 1 this ensures that requests
are balanced across workers in a single threaded application.
This can avoid deadlocks when a single threaded app sends a
request to itself. (For example, to generate a PDF.)