Merge pull request dpkp#10 from aiven/orange-cpu-usage-while-socket-c…

…losed-revert-sleep

Avoid 100% CPU usage while socket is closed (sleep)

aiven#10

kafka/client_async.py

@@ -636,7 +636,7 @@ def _poll(self, timeout):
 
         for key, events in ready:
             if key.fileobj.fileno() < 0:
-                self._selector.unregister(key.fileobj)
+                time.sleep(0.1)
 
             if key.fileobj is self._wake_r:
                 self._clear_wake_fd()