KAFKA-709 Default queue.enqueue.timeout.ms to -1; reviewed by Jay Kreps
KAFKA-709 change in default blocking tripped test checking queue is full so updated test in case someone changes the new default to something else
Some arguments are always set to default in ProducerPerformance; patched by John Fung; committed by Jun Rao; kafka-710
Merge remote branch 'origin/0.8' into trunk