Fix bug #100: bug #100 happened because the active CKPT server somehow didn't remove the peer address out off the replicaList of the checkpoints on node down. The root cause is similar to bug #31 that the replica list is reset for the peer being welcomed. However, it only reset replica list for the peer that exists in the  peerList. In this patch, the replica list reseting routine is moved outside of the peer exist checking routine to make sure it also reset replica list for the peer that does not exist in the  peerList.