[twisted] add an option to configure twisted's threadpool size
Twisted's threadpool size defaults to 10, which means we virtually try
to serve up to 10 simulateneous requests but connection-pool size
defaults to 4 on CW-server side. That means that under heavy load, chances
are high that some HTTP queries end up with a 500 error code / connection-pool
exhausted.
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"""web only
"""