Fix potential EMFILE when retrying to connect indefinitely

neo/lib/event.py

@@ -135,6 +135,11 @@ class EpollEventManager(object):
                 self._closeAppend(connector.shutdown())
                 if self._closeAcquire(0):
                     self._closeRelease()
+            return
+        if close:
+            # The connection is not registered, so do not wait for epoll
+            # to wake up (which may not even happen, and lead to EMFILE).
+            connector.shutdown()()
 
     def isIdle(self):
         return not (self._pending_processing or self.writer_set)