Fixed missing items issue during replication. It was because TapProducer missed sending the last mutation from checkpoint to slave.
Fixed missing items issue during replication. It was because TapProducer missed
sending the last mutation from checkpoint to slave.

Signed-off-by: Vandana Shah <e8ef6bf8167176b52453793987ce7a4a0f6d30eb@zynga.com>

zbase/ep-engine,zbase/ep-engine,zbase/ep-engine,zbase/ep-engine,zbase/ep-engine