Added RAMCloud replication parameter to cluster script.
Modified onos.sh so that RAMCloud host parameter falls back to hostname.
Added usage for "deldb" option to onos.sh.
Added interactive confirmation of deldb to onos.sh.

Change-Id: Icf7022574758bc544d1e2f85abc0f83a7e8e48d8
diff --git a/cluster-mgmt/conf/onos-cluster.conf b/cluster-mgmt/conf/onos-cluster.conf
index d36dd35..ddf99b2 100644
--- a/cluster-mgmt/conf/onos-cluster.conf
+++ b/cluster-mgmt/conf/onos-cluster.conf
@@ -10,6 +10,10 @@
 # Protocol used by RAMCloud cluster (fast+udp by default)
 #cluster.hosts.ramcloud.protocol = fast+udp
 
+# Number of RAMCloud replicas (0 by default)
+# On N node cluster, maximum value will be N-1 replicas
+#cluster.hosts.ramcloud.server.replicas = 0
+
 # Communication method used for Hazelcast communication
 #cluster.hosts.hazelcast.network = multicast
 cluster.hosts.hazelcast.network = tcp-ip