(socket utility) move ix::getFreePort to ixwebsocket library

ixsnake/ixsnake/IXSnakeConnectionState.h

@@ -19,11 +19,7 @@ namespace snake
     public:
         virtual ~SnakeConnectionState()
         {
-            if (subscriptionThread.joinable())
-            {
-                subscriptionRedisClient.stop();
-                subscriptionThread.join();
-            }
+            stopSubScriptionThread();
         }
 
         std::string getNonce()
@@ -61,6 +57,15 @@ namespace snake
             return _redisClient;
         }
 
+        void stopSubScriptionThread()
+        {
+            if (subscriptionThread.joinable())
+            {
+                subscriptionRedisClient.stop();
+                subscriptionThread.join();
+            }
+        }
+
         // We could make those accessible through methods
         std::thread subscriptionThread;
         std::string appChannel;

ixsnake/ixsnake/IXSnakeProtocol.cpp

@@ -261,7 +261,7 @@ namespace snake
         auto body = pdu["body"];
         auto subscriptionId = body["subscription_id"];
 
-        state->redisClient().stop();
+        state->stopSubScriptionThread();
 
         nlohmann::json response = {{"action", "rtm/unsubscribe/ok"},
                                    {"id", pduId},