Bug 1849869

Description of problem:
Unable to recycle executor when the memory limit is reached. The world got terminated but no new world is created. The executor process doesn't exit.

Steps to Reproduce:
Setting the "EXECUTOR_MEMORY_LIMIT" to something very low which will trigger the refresh pretty much 60 seconds after the starting the executor.

----------------------------
#Set memory limit for executor process, before it's restarted automatically
EXECUTOR_MEMORY_LIMIT=200mb

#Set delay before first memory polling to let executor initialize (in sec)
EXECUTOR_MEMORY_MONITOR_DELAY=60 #default: 2 hours
----------------------------


Observed that:
- the world got terminated when the memory limit is reached.
- memory is not freed and no more executor showing in the Dynflow status page.
- running task will enter paused stated and never able to resume/cancel even after restarting the dynflowd.

Log:
Everything ready for world: da8f1461-7891-47a1-a39a-2ff44c0492bd
World has been terminated
<getting dead letter error>

# ps -aux | grep -i dynflow
foreman  18794 22.8  2.0 2572916 409472 ?      Sl   17:37   1:05 dynflow_executor
foreman  18795  0.0  0.6 581248 126556 ?       Sl   17:37   0:00 dynflow_executor_monitor

Same behaviour on both Satellite 6.6 and 6.7 but working on Satellite 6.5. 


Actual results:
failed to recycle executor

Expected results:
executor can be recycled successfully