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.

lncfg/protocol.go

@@ -141,6 +141,11 @@ func (l *ProtocolOptions) NoExperimentalEndorsement() bool {
 	return l.NoExperimentalEndorsementOption
 }
 
+// NoQuiescence returns true if quiescence is disabled.
+func (l *ProtocolOptions) NoQuiescence() bool {
+	return true
+}
+
 // CustomMessageOverrides returns the set of protocol messages that we override
 // to allow custom handling.
 func (p ProtocolOptions) CustomMessageOverrides() []uint16 {