htlcswitch+peer: allow the disabling of quiescence

Here we add a flag where we can disable quiescence. This will be used
in the case where the feature is not negotiated with our peer.

htlcswitch/link.go

@@ -283,6 +283,10 @@ type ChannelLinkConfig struct {
 	// invalid.
 	DisallowRouteBlinding bool
 
+	// DisallowQuiescence is a flag that can be used to disable the
+	// quiescence protocol.
+	DisallowQuiescence bool
+
 	// MaxFeeExposure is the threshold in milli-satoshis after which we'll
 	// restrict the flow of HTLCs and fee updates.
 	MaxFeeExposure lnwire.MilliSatoshi
@@ -476,14 +480,19 @@ func NewChannelLink(cfg ChannelLinkConfig,
 		cfg.MaxFeeExposure = DefaultMaxFeeExposure
 	}
 
-	quiescerCfg := QuiescerCfg{
-		chanID: lnwire.NewChanIDFromOutPoint(
-			channel.ChannelPoint(),
-		),
-		channelInitiator: channel.Initiator(),
-		sendMsg: func(s lnwire.Stfu) error {
-			return cfg.Peer.SendMessage(false, &s)
-		},
+	var qsm Quiescer
+	if !cfg.DisallowQuiescence {
+		qsm = NewQuiescer(QuiescerCfg{
+			chanID: lnwire.NewChanIDFromOutPoint(
+				channel.ChannelPoint(),
+			),
+			channelInitiator: channel.Initiator(),
+			sendMsg: func(s lnwire.Stfu) error {
+				return cfg.Peer.SendMessage(false, &s)
+			},
+		})
+	} else {
+		qsm = &quiescerNoop{}
 	}
 
 	quiescenceReqs := make(
@@ -499,7 +508,7 @@ func NewChannelLink(cfg ChannelLinkConfig,
 		flushHooks:          newHookMap(),
 		outgoingCommitHooks: newHookMap(),
 		incomingCommitHooks: newHookMap(),
-		quiescer:            NewQuiescer(quiescerCfg),
+		quiescer:            qsm,
 		quiescenceReqs:      quiescenceReqs,
 		ContextGuard:        fn.NewContextGuard(),
 	}