htlcswitch: remove unused Disconnect from Peer interface

htlcswitch/mock.go

@@ -506,12 +506,6 @@ func (s *mockServer) PubKey() [33]byte {
 	return s.id
 }
 
-func (s *mockServer) Disconnect(reason error) {
-	fmt.Printf("server %v disconnected due to %v\n", s.name, reason)
-
-	s.t.Fatalf("server %v was disconnected: %v", s.name, reason)
-}
-
 func (s *mockServer) WipeChannel(*wire.OutPoint) error {
 	return nil
 }