baseserver: no real need to spawn a greenlet here

--HG--
extra : transplant_source : %03%FAK%F2%9E%F4%A6%B1%C2%D9f%00%3A%FEL%22%80%BB%18%A0

gevent/baseserver.py

@@ -179,7 +179,7 @@ class BaseServer(object):
         try:
             self._stopped_event.wait()
         except:
-            Greenlet.spawn(self.stop, timeout=stop_timeout).join()
+            self.stop(timeout=stop_timeout)
             raise