feat: handle todo to close topo server

Signed-off-by: Manan Gupta <[email protected]>

go/vt/vtorc/logic/tablet_discovery.go

@@ -64,7 +64,6 @@ func RegisterFlags(fs *pflag.FlagSet) {
 // OpenTabletDiscovery opens the vitess topo if enables and returns a ticker
 // channel for polling.
 func OpenTabletDiscovery() <-chan time.Time {
-	// TODO(sougou): If there's a shutdown signal, we have to close the topo.
 	ts = topo.Open()
 	tmc = tmclient.NewTabletManagerClient()
 	// Clear existing cache and perform a new refresh.

go/vt/vtorc/logic/vtorc.go

@@ -129,6 +129,7 @@ func closeVTOrc() {
 	_ = inst.AuditOperation("shutdown", "", "Triggered via SIGTERM")
 	// wait for the locks to be released
 	waitForLocksRelease()
+	ts.Close()
 	log.Infof("VTOrc closed")
 }