multi: add logs when subservers are starting

Also unified the log messages.

contractcourt/breacharbiter.go

@@ -206,14 +206,13 @@ func NewBreachArbiter(cfg *BreachConfig) *BreachArbiter {
 func (b *BreachArbiter) Start() error {
 	var err error
 	b.started.Do(func() {
+		brarLog.Info("Breach arbiter starting")
 		err = b.start()
 	})
 	return err
 }
 
 func (b *BreachArbiter) start() error {
-	brarLog.Tracef("Starting breach arbiter")
-
 	// Load all retributions currently persisted in the retribution store.
 	var breachRetInfos map[wire.OutPoint]retributionInfo
 	if err := b.cfg.Store.ForAll(func(ret *retributionInfo) error {

contractcourt/chain_arbitrator.go

@@ -487,7 +487,7 @@ func (c *ChainArbitrator) Start() error {
 		return nil
 	}
 
-	log.Tracef("Starting ChainArbitrator")
+	log.Info("ChainArbitrator starting")
 
 	// First, we'll fetch all the channels that are still open, in order to
 	// collect them within our set of active contracts.

contractcourt/utxonursery.go

@@ -241,7 +241,7 @@ func (u *UtxoNursery) Start() error {
 		return nil
 	}
 
-	utxnLog.Tracef("Starting UTXO nursery")
+	utxnLog.Info("UTXO nursery starting")
 
 	// Retrieve the currently best known block. This is needed to have the
 	// state machine catch up with the blocks we missed when we were down.