refactor(FQDN): feather refactor on client and host_port.h

Author: Samunroyu

src/meta/meta_data.h

@@ -327,15 +327,11 @@ class app_state_helper
     app_state *owner{nullptr};
     std::atomic_int partitions_in_progress{0};
     std::vector<config_context> contexts;
-    dsn::message_ex *pending_response;
+    dsn::message_ex *pending_response{nullptr};
     std::vector<restore_state> restore_states;
     split_state split_states;
 
-    app_state_helper() : partitions_in_progress(0)
-    {
-        contexts.clear();
-        pending_response = nullptr;
-    }
+    app_state_helper() = default;
     void on_init_partitions();
     void clear_proposals()
     {

src/meta/test/meta_data.cpp

@@ -46,7 +46,8 @@ TEST(meta_data, dropped_cmp)
 {
     host_port n;
 
-    dropped_replica d1, d2;
+    dropped_replica d1;
+    dropped_replica d2;
     // time not equal
     {
         d1 = {n, 10, 5, 5, 5};