build: Fix compilation warnings/errors with clang-700.0.72 (apple LLVM 7.0.0)

Change-Id: Iedbebae03740a5d779c84e78d22b74dd9b9009f7
Refs: #3209

daemon/face/ethernet-factory.hpp

@@ -85,7 +85,7 @@ public:
   getMulticastFaces() const;
 
   virtual std::list<shared_ptr<const Channel>>
-  getChannels() const;
+  getChannels() const DECL_OVERRIDE;
 
 private:
   /**

daemon/face/tcp-factory.hpp

@@ -86,7 +86,7 @@ public:
              const FaceConnectFailedCallback& onConnectFailed) DECL_OVERRIDE;
 
   virtual std::list<shared_ptr<const Channel> >
-  getChannels() const;
+  getChannels() const DECL_OVERRIDE;
 
 PUBLIC_WITH_TESTS_ELSE_PRIVATE:
 

daemon/face/udp-factory.hpp

@@ -150,7 +150,7 @@ public:
              const FaceConnectFailedCallback& onConnectFailed) DECL_OVERRIDE;
 
   virtual std::list<shared_ptr<const Channel>>
-  getChannels() const;
+  getChannels() const DECL_OVERRIDE;
 
   /**
    * \brief Get map of configured multicast faces

daemon/face/unix-stream-factory.hpp

@@ -66,7 +66,7 @@ public:
              const FaceConnectFailedCallback& onConnectFailed) DECL_OVERRIDE;
 
   virtual std::list<shared_ptr<const Channel> >
-  getChannels() const;
+  getChannels() const DECL_OVERRIDE;
 
 private:
   /**

daemon/face/websocket-factory.hpp

@@ -86,7 +86,7 @@ public:
              const FaceConnectFailedCallback& onConnectFailed) DECL_OVERRIDE;
 
   virtual std::list<shared_ptr<const Channel> >
-  getChannels() const;
+  getChannels() const DECL_OVERRIDE;
 
 private:
   /**