Add packet injector test frame

src/stellar/main.cpp

@@ -115,6 +115,11 @@ int main(int argc, char **argv)
             stellar_stat_output(runtime->stat);
         }
         usleep(1000); // 1ms
+
+        if (packet_io_wait_exit(runtime->packet_io))
+        {
+            ATOMIC_SET(&runtime->need_exit, 1);
+        }
     }
 
 error_out: