Resolve issues with close and __gc methods
Fixed issues:
- consumer and producer yields in lua __gc meta methods which leads to crash for whole tarantool (?) - fixed by removing lua __gc meta methods and moving it's logic into separate destroy C functions which will be called from lua close methods of Consumer / Producer
- consumer:close sometimes hangs forever - fixed byfollowing changes:
- now we instantly destroying librdkafka messages on consume in poll thread which prevents rd_kafka_close and rd_kafka_destroy C functions hangs cause of busy resources
- now lua Consumer stops polling fibers only after librdkafka consumer was closed which prevents non handeled callbacks from closing operation
- producer sometimes hangs forever - updated librdkafka to 1.5.2