Fix: segfault due to use after free in workers thread#1138
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NodeDisconnect calls worker.WorkComplete() which deletes the callback, while the thread is still alive, creating use after free segmentation fault.
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When NodeDisconnect calls worker.WorkComplete() and Destroy() at https://github.com/Blizzard/node-rdkafka/blob/master/src/kafka-consumer.cc#L1396 sets the callback to null, while the thread is inside the loop stopping or starting in a race, creating "use after free" segmentation fault in the message callback handler on Linux.
Closes: #1057
cc: @GaryWilber