remove unnecessary welcome message

cli/src/machineioman.cpp

@@ -28,7 +28,7 @@ void MachineIoMan::printMessage(std::string msg, OutMsgType type) {
 }
 
 void MachineIoMan::printWelcomeMessage() {
-  std::cout << "please enter user and password" << std::endl;
+  //~ std::cout << "please enter user and password" << std::endl;
 }
 
 std::string MachineIoMan::getCmdPrompt() { return ""; }