multi: add debug logs to catch slow shutdown

contractcourt/breacharbiter.go

@@ -310,7 +310,8 @@ func (b *BreachArbiter) start() error {
 // the BreachArbiter have gracefully exited.
 func (b *BreachArbiter) Stop() error {
 	b.stopped.Do(func() {
-		brarLog.Infof("Breach arbiter shutting down")
+		brarLog.Infof("Breach arbiter shutting down...")
+		defer brarLog.Debug("Breach arbiter shutdown complete")
 
 		close(b.quit)
 		b.wg.Wait()

contractcourt/chain_arbitrator.go

@@ -919,7 +919,8 @@ func (c *ChainArbitrator) Stop() error {
 		return nil
 	}
 
-	log.Info("ChainArbitrator shutting down")
+	log.Info("ChainArbitrator shutting down...")
+	defer log.Debug("ChainArbitrator shutdown complete")
 
 	close(c.quit)
 

contractcourt/utxonursery.go

@@ -319,7 +319,8 @@ func (u *UtxoNursery) Stop() error {
 		return nil
 	}
 
-	utxnLog.Infof("UTXO nursery shutting down")
+	utxnLog.Infof("UTXO nursery shutting down...")
+	defer utxnLog.Debug("UTXO nursery shutdown complete")
 
 	close(u.quit)
 	u.wg.Wait()