do not contact beacon if not in peer discovery mode

add a -P option to disable peer discovery in deploy.sh

Signed-off-by: Leo Chen <leo@harmony.one>

client/txgen/main.go

@@ -170,6 +170,7 @@ func main() {
 	// Start the client server to listen to leader's message
 	go clientNode.StartServer()
 
+	if *peerDiscovery {
 		for _, leader := range shardIDLeaderMap {
 			log.Debug("Client Join Shard", "leader", leader)
 			go clientNode.JoinShard(leader)
@@ -178,6 +179,7 @@ func main() {
 			clientNode.StopPing <- struct{}{}
 			clientNode.State = node.NodeJoinedShard
 		}
+	}
 
 	// Transaction generation process
 	time.Sleep(10 * time.Second) // wait for nodes to be ready

deploy.sh

@@ -31,6 +31,7 @@ USAGE: $ME [OPTIONS] config_file_name
 
    -h             print this help message
    -p             use peer discovery (default: $PEER)
+   -P             do not use peer discovery
    -d             enable db support (default: $DB)
    -t             toggle txgen (default: $TXGEN)
    -D duration    txgen run duration (default: $DURATION)
@@ -57,10 +58,11 @@ MIN=5
 SHARDS=2
 KILLPORT=9004
 
-while getopts "hpdtD:m:s:k:" option; do
+while getopts "hpdtD:m:s:k:P" option; do
    case $option in
       h) usage ;;
       p) PEER='-peer_discovery' ;;
+      P) PEER= ;;
       d) DB='-db_supported' ;;
       t) TXGEN=$OPTARG ;;
       D) DURATION=$OPTARG ;;