MXS-2314 Move journal checking inside Monitor

include/maxscale/monitor.hh

@@ -337,6 +337,13 @@ protected:
      */
     void detect_handle_state_changes();
 
+    /**
+     * Is the journal stale?
+     *
+     * @return True, if the journal is stale, false otherwise.
+     */
+    bool journal_is_stale() const;
+
     /**
      * @brief Called when a server has been added to the monitor.
      *
@@ -450,8 +457,6 @@ private:
      * @brief The monitor should populate associated services.
      */
     virtual void populate_services();
-
-    bool journal_is_stale();
 };
 
 /**