clang-tidy: Enable readability-make-member-function-const check

Finds non-static member functions that can be made const because the
functions don’t use this in a non-const way.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: Iff3a367401d571f9fcff90539aaab59e2c66e627
diff --git a/test/test_activation.cpp b/test/test_activation.cpp
index f63ee11..b7ec3d5 100644
--- a/test/test_activation.cpp
+++ b/test/test_activation.cpp
@@ -44,23 +44,23 @@
         utils::freeUtils();
     }
 
-    void onUpdateDone()
+    void onUpdateDone() const
     {
         activation->onUpdateDone();
     }
-    void onUpdateFailed()
+    void onUpdateFailed() const
     {
         activation->onUpdateFailed();
     }
-    int getProgress()
+    int getProgress() const
     {
         return activation->activationProgress->progress();
     }
-    const auto& getPsuQueue()
+    const auto& getPsuQueue() const
     {
         return activation->psuQueue;
     }
-    std::string getUpdateService(const std::string& psuInventoryPath)
+    std::string getUpdateService(const std::string& psuInventoryPath) const
     {
         return activation->getUpdateService(psuInventoryPath);
     }