Connection refused in ControllerUpgradeTest.test_updating_cluster_when_executing_operations

[dlex]

Module: rptest.tests.controller_upgrade_test
Class: ControllerUpgradeTest
Method: test_updating_cluster_when_executing_operations

FAIL test: ControllerUpgradeTest.test_updating_cluster_when_executing_operations (1/52 runs)

failure at 2022-10-29T16:34:51.349Z: ConnectionError(MaxRetryError("HTTPConnectionPool(host='docker-rp-7', port=9644): Max retries exceeded with url: /v1/security/users/fuzzy-operator-6106-user-shivhb 
  (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f990a458d60>: Failed to establish a new connection: [Errno 111] Connection refused')
  )"))

in job https://buildkite.com/redpanda/redpanda/builds/17578#01842419-e718-4248-9c19-e5372456fa4a

test_id:    rptest.tests.controller_upgrade_test.ControllerUpgradeTest.test_updating_cluster_when_executing_operations
status:     FAIL
run time:   1 minute 13.493 seconds


    ConnectionError(MaxRetryError("HTTPConnectionPool(host='docker-rp-7', port=9644): Max retries exceeded with url: /v1/security/users/fuzzy-operator-6106-user-shivhb (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f990a458d60>: Failed to establish a new connection: [Errno 111] Connection refused'))"))
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/urllib3/connection.py", line 159, in _new_conn
    conn = connection.create_connection(
  File "/usr/local/lib/python3.10/dist-packages/urllib3/util/connection.py", line 84, in create_connection
    raise err
  File "/usr/local/lib/python3.10/dist-packages/urllib3/util/connection.py", line 74, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

[VladLazar]

https://buildkite.com/redpanda/redpanda/builds/17661#0184303d-311e-4106-b7e2-b3e45ae1e26f

[mmaslankaprv]

This is pretty much the same issue as in #6892