Fixed multithread sync issue and duplicate thread on termination.

Subscription.cpp

@@ -51,7 +51,7 @@ namespace core
 
    int Subscription::process(coreutils::ZString &request, std::stringstream &out, TCPSession &session)
    {
-      std::cout << "(" << handler << ")" << std::endl;
+//      std::cout << "(" << handler << ")" << std::endl;
       if (handler)
          handler->process(request, out, session);
       else