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MultiThreadingMgr::startProcessing and MultiThreadingMgr::stopProcessing must be thread safe

it seems that MultiThreadingMgr::startProcessing and MultiThreadingMgr::stopProcessing do stop the MT http listener and client, but the check for the isInCriticalSection is not thread safe and a race can happen.

solution - make thread safe:

isInCriticalSection 
startProcessing
stopProcessing

related to https://support.isc.org/Ticket/Display.html?id=18750

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