magnum k8s cluster creation fails

[Jan Horstmann]

Hey,
it seems that
https://review.opendev.org/#/c/738253/1
broke k8s cluster creation via magnum for us.
With

"""
[magnum_client]
endpoint_type = internalURL
"""

software deployments inside instances fail because the internal endpoint cannot be reached:
"""
# openstack coe cluster create --cluster-template k8s-v1.17.8 --master-count 3 --node-count 3 --keypair k8s k8s-test
# openstack stack resource list -n 5 k8s-test-ic7y5s764wyf | grep 49532160-6248-4cd9-8acc-196cd1e5a044
| master_config_deployment | 49532160-6248-4cd9-8acc-196cd1e5a044 | OS::Heat::SoftwareDeployment | CREATE_FAILED | 2020-07-01T07:54:39Z | k8s-test-ic7y5s764wyf-kube_masters-ghhhqj6bnejr-0-nc7caclqhjaw |

# openstack software deployment output show --all --long 49532160-6248-4cd9-8acc-196cd1e5a044

[...]

    + curl -X GET -H 'X-Auth-Token: TOKEN' -H 'OpenStack-API-Version: container-infra latest' http://INTERNAL_IP:9511/v1/certificates/29495688-be31-4f2c-bbe3-a7081e1ae670
      % Total % Received % Xferd Average Speed Time Time Time Current
                                     Dload Upload Total Spent Left Speed

      0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
      0 0 0 0 0 0 0 0 --:--:-- 0:00:01 --:--:-- 0
      0 0 0 0 0 0 0 0 --:--:-- 0:00:02 --:--:-- 0
      0 0 0 0 0 0 0 0 --:--:-- 0:00:03 --:--:-- 0
      0 0 0 0 0 0 0 0 --:--:-- 0:00:04 --:--:-- 0
[...]
   curl: (28) Failed to connect to INTERNAL_IP port 9511: Connection timed out
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/lib64/python3.8/json/__init__.py", line 293, in load
        return loads(fp.read(),
      File "/usr/lib64/python3.8/json/__init__.py", line 357, in loads
        return _default_decoder.decode(s)
      File "/usr/lib64/python3.8/json/decoder.py", line 337, in decode
        obj, end = self.raw_decode(s, idx=_w(s, 0).end())
      File "/usr/lib64/python3.8/json/decoder.py", line 355, in raw_decode
        raise JSONDecodeError("Expecting value", s, err.value) from None
    json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
  deploy_status_code: 1
"""

Overwriting "[magnum_client]endpoint_type" to "publicURL" makes cluster creation possible again.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/738760

[OpenStack Infra (hudson-openstack)]

Change abandoned by Jan Horstmann (<email address hidden>) on branch: master
Review: https://review.opendev.org/738760