avoid ticker leak

unmaintained/stress_filer_upload/bench_filer_upload/bench_filer_upload.go

@@ -66,6 +66,7 @@ func main() {
 
 	go func() {
 		ticker := time.NewTicker(1000 * time.Millisecond)
+		defer ticker.Stop()
 
 		var lastTime time.Time
 		var counter, size int64

unmaintained/stress_filer_upload/stress_filer_upload_actual/stress_filer_upload.go

@@ -72,6 +72,7 @@ func main() {
 
 	go func() {
 		ticker := time.NewTicker(500 * time.Millisecond)
+		defer ticker.Stop()
 
 		var lastTime time.Time
 		var counter, size int64

weed/server/master_grpc_server.go

@@ -297,6 +297,7 @@ func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServ
 	}()
 
 	ticker := time.NewTicker(5 * time.Second)
+	defer ticker.Stop()
 	for {
 		select {
 		case message := <-messageChan:

weed/server/volume_grpc_client_to_master.go

@@ -159,7 +159,9 @@ func (vs *VolumeServer) doHeartbeat(masterAddress pb.ServerAddress, grpcDialOpti
 	}
 
 	volumeTickChan := time.NewTicker(sleepInterval)
+	defer volumeTickChan.Stop()
 	ecShardTickChan := time.NewTicker(17 * sleepInterval)
+	defer ecShardTickChan.Stop()
 	dataCenter := vs.store.GetDataCenter()
 	rack := vs.store.GetRack()
 	ip := vs.store.Ip