Event queue stats in live replication output (similar to issue #115)

[pamelayin]

I have left comment here #115 (comment) but basically this is similar issue as 115. It was fixed for replicating from redis, but it seems like it's not showing when replicating from elasticache. This was observed in version 3.1.3 as well.

/riot-3.1.1/bin/riot <elasticache source> replicate <redis target> --mode live --type ds
Listening  ? % [=                                                 ] 0/? (0:00:00 / ?) ?/s
Scanning 100% [=========================] 4000/4000 (0:00:06 / 0:00:00) 666.7/s