Bugfixes

- Collectagent will not hang anymore when pushers crash or terminate abruptly without properly closing their connections
- Issue was related to message buffers not being cleaned up in SimpleMQTTServerMessageThread upon a connection release

CollectAgent/simplemqttserverthread.cpp

@@ -509,6 +509,10 @@ void SimpleMQTTServerMessageThread::releaseConnection(int connectionId)
   fds[connectionId].fd = -1;
   fds[connectionId].events = 0;
   fds[connectionId].revents = 0;
+  if (msg[connectionId]) {
+      delete msg[connectionId];
+      msg[connectionId] = NULL;
+  }
   numConnections--;
 
 #ifdef SimpleMQTTVerbose