crdt: bugfix: do not send all msgs to same replica
crdt: bugfix: do not send all msgs to same replica

Fixed communication bug when dht_node caching was enabled.
The bug caused that a single replica received all message of all
replicas. The other replicas never received any messages at all.

Oops!

scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris