`get` should ignore response code 409

[tschale]

Applied the rabbitmq cluster-operator (https://github.com/rabbitmq/cluster-operator/releases/latest/download/cluster-operator.yml) and following RabbitmqCluster definition:

apiVersion: rabbitmq.com/v1beta1
kind: RabbitmqCluster
metadata:
  name: proj-rabbitmq

Applying it once works, after that get fails because of a 409 response.

Stacktrace:

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "getdeck.__main__", line 145, in main
  File "getdeck.api.utils", line 10, in wrapper
  File "getdeck.api.get", line 112, in run_deck
  File "getdeck.api.get", line 97, in run_deck
  File "getdeck.k8s", line 94, in k8s_create_or_patch
RuntimeError: (409)