daemon: mark some classes and methods 'final'

As suggested by gcc's -Wsuggest-final-types and -Wsuggest-final-methods

Change-Id: I1622857ee53581efd0c6ce3fe93199c72202d817
diff --git a/daemon/mgmt/strategy-choice-manager.hpp b/daemon/mgmt/strategy-choice-manager.hpp
index 370364b..6c91af8 100644
--- a/daemon/mgmt/strategy-choice-manager.hpp
+++ b/daemon/mgmt/strategy-choice-manager.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -38,7 +38,7 @@
  * @brief Implements the Strategy Choice Management of NFD Management Protocol.
  * @sa https://redmine.named-data.net/projects/nfd/wiki/StrategyChoice
  */
-class StrategyChoiceManager : public ManagerBase
+class StrategyChoiceManager final : public ManagerBase
 {
 public:
   StrategyChoiceManager(strategy_choice::StrategyChoice& table,