UDP shutdown fixed

testApp/client/testStartStop.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+#include <pv/clientFactory.h>
+
+int main(int argc, char *argv[]) {
+   std::cout << "to start pvAccess ClientFactory" << std::endl;
+   ::epics::pvAccess::ClientFactory::start();
+   std::cout << "do nothing after starting pvAccess ClientFactory" << std::endl;
+
+   std::cout << "to stop pvAccess ClientFactory" << std::endl;
+   ::epics::pvAccess::ClientFactory::stop();
+   std::cout << "finish test" << std::endl;
+   return 0;
+
+}