Improve wakeup handling

Author: mdellweg

pulpcore/tasking/worker.py

@@ -484,6 +484,8 @@ def handle_available_tasks(self):
         """
         keep_looping = True
         while keep_looping and not self.shutdown_requested:
+            # Clear pending wakeups. We are about to handle them anyway.
+            self.wakeup = False
             try:
                 with PGAdvisoryLock(TASK_UNBLOCKING_LOCK):
                     keep_looping = self.unblock_tasks()