Return proper MySQL connection for syncrhonous requests based on calling thread instead of bundled connection.

--HG--
branch : trunk

src/server/shared/Database/MySQLConnection.cpp

@@ -26,7 +26,9 @@
 #include "Timer.h"
 
 MySQLConnection::MySQLConnection() :
-m_Mysql(NULL)
+m_Mysql(NULL),
+m_worker(NULL),
+m_queue(NULL)
 {
 }