Fix Tenacity errors which are happening in CHECK_COMMAND_LINE_STATUS

[sivkovic]

Traceback:

Traceback (most recent call last):
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/celery/app/trace.py", line 412, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/celery/app/trace.py", line 704, in __protected_call__
    return self.run(*args, **kwargs)
  File "/srv/services/ridgeback/code/ridgeback/orchestrator/tasks.py", line 143, in command_processor
    check_status_of_command_line_jobs(job)
  File "/srv/services/ridgeback/code/ridgeback/orchestrator/tasks.py", line 381, in check_status_of_command_line_jobs
    command_line_status = submiter.get_commandline_status(track_cache_str)
  File "/srv/services/ridgeback/code/ridgeback/submitter/toil_submitter/toil_jobsubmitter.py", line 81, in get_commandline_status
    toil_track_obj.check_status()
  File "/srv/services/ridgeback/code/ridgeback/submitter/toil_submitter/toil_track_utils.py", line 654, in check_status
    job_store, root_job = _resume_job_store(self.job_store_path, self.total_attempts)
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/tenacity/__init__.py", line 339, in wrapped_f
    return self(f, *args, **kw)
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/tenacity/__init__.py", line 430, in __call__
    do = self.iter(retry_state=retry_state)
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/tenacity/__init__.py", line 379, in iter
    six.raise_from(retry_exc, fut.exception())
  File "<string>", line 3, in raise_from
tenacity.RetryError: <Future at 0x7fe9d6ac96d8 state=finished raised KeyError>
[2021-08-17 11:43:35,153: ERROR/MainProcess] Task handler raised error: <MaybeEncodingError: Error sending result: '"(1, <ExceptionInfo: RetryError('<Future at 0x7fe9d6ac96d8 state=finished raised KeyError>')>, None)"'. Reason: ''PicklingError("Can\'t pickle <class \'tenacity.RetryError\'>: it\'s not the same object as tenacity.RetryError")''.>
Traceback (most recent call last):
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/billiard/pool.py", line 366, in workloop
    put((READY, (job, i, result, inqW_fd)))
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/billiard/queues.py", line 366, in put
    self.send_payload(ForkingPickler.dumps(obj))
  File "/juno/work/ci/prod_ridgeback/venv/lib/python3.7/site-packages/billiard/reduction.py", line 56, in dumps
    cls(buf, protocol).dump(obj)
billiard.pool.MaybeEncodingError: Error sending result: '"(1, <ExceptionInfo: RetryError('<Future at 0x7fe9d6ac96d8 state=finished raised KeyError>')>, None)"'. Reason: ''PicklingError("Can\'t pickle <class \'tenacity.RetryError\'>: it\'s not the same object as tenacity.RetryError")''.```