Updated the default setup for the cluster backend, so it is
consistent with conf/onos_node.conf

Change-Id: Id48d5e641c101817bbc10a44d7c10b9afe072144
diff --git a/cluster-mgmt/conf/onos-cluster.conf b/cluster-mgmt/conf/onos-cluster.conf
index 73b228d..09e6da2 100644
--- a/cluster-mgmt/conf/onos-cluster.conf
+++ b/cluster-mgmt/conf/onos-cluster.conf
@@ -4,8 +4,8 @@
 cluster.hosts.names = onosdev1, onosdev2, onosdev3, onosdev4
 
 # Back-end module to store topology/flows
-cluster.hosts.backend = ramcloud
-#cluster.hosts.backend = hazelcast
+cluster.hosts.backend = hazelcast
+#cluster.hosts.backend = ramcloud
 
 # Protocol used by RAMCloud cluster (fast+udp by default)
 #cluster.hosts.ramcloud.protocol = fast+udp