[#632] - fix a race condition causing messages to be lost with non-zero max_msgs in a cluster
[#632] - fix a race condition causing messages to be lost with non-zero max_msgs in a cluster

nats-io/gnatsd,nats-io/gnatsd,wallyqs/gnatsd,apcera/gnatsd,wallyqs/gnatsd,apcera/gnatsd