message: http: Remove unnecessary event_base_loopexit call
  Let event base loop exit cleanly by processing all active and pending
  events. The call is no longer necessary because closing persistent
  connections is now properly handled.
diff: @@ -470,8 +470,6 @@ void StopHTTPServer()
  boundSockets.clear();
  if (eventBase) {
  LogPrint(BCLog::HTTP, "Waiting for HTTP event thread to exit\n");
  - // Exit the event loop as soon as there are no active events.
  - event_base_loopexit(eventBase, nullptr);
  // Give event loop a few seconds to exit (to send back last RPC responses), then break it
  // Before this was solved with event_base_loopexit, but that didn't work as expected in
  // at least libevent 2.0.21 and always introduced a delay. In libevent
  