Fails to the functional test for a ControllerRevision

[Naoaki Horie]

The functional test for a ControllerRevision [1] is failed due to a "module 'kubernetes.client' has no attribute 'object" error.

[1] https://github.com/openstack/tacker/blob/master/tacker/tests/functional/vnflcm/test_kubernetes.py#L358-L392

The details of tacker logs are as follows.
```
Jan 05 06:53:25.363944 ubuntu-focal-limestone-regionone-0022391378 tacker-conductor[35808]: 2021-01-05 06:53:25.363 ERROR tacker.vnfm.infra_drivers.kubernetes.k8s.translate_outputs [req-70fc6e94-2d25-4fa9-9690-dc2d9812e73d nfv_user nfv] ControllerRevision create failure. Reason=module 'kubernetes.client' has no attribute 'object'
Jan 05 06:53:25.364704 ubuntu-focal-limestone-regionone-0022391378 tacker-conductor[35808]: 2021-01-05 06:53:25.364 ERROR tacker.vnflcm.vnflcm_driver [req-70fc6e94-2d25-4fa9-9690-dc2d9812e73d nfv_user nfv] Unable to instantiate vnf instance 1b56aa3e-1495-4bd4-a080-eda8ead2007f due to error : Failed to init resource.: tacker.common.exceptions.InitApiFalse: Failed to init resource.
Jan 05 06:53:25.366124 ubuntu-focal-limestone-regionone-0022391378 tacker-conductor[35808]: 2021-01-05 06:53:25.365 ERROR root [req-70fc6e94-2d25-4fa9-9690-dc2d9812e73d nfv_user nfv] Original exception being dropped: ['
Traceback (most recent call last):
  File "/opt/stack/tacker/tacker/vnfm/infra_drivers/kubernetes/k8s/translate_outputs.py", line 303, in get_k8s_objs_from_yaml
    k8s_obj[\'object\'] = self._create_k8s_object(
  File "/opt/stack/tacker/tacker/vnfm/infra_drivers/kubernetes/k8s/translate_outputs.py", line 283, in _create_k8s_object
    self._init_k8s_obj(k8s_obj, file_content_dict, must_param)
  File "/opt/stack/tacker/tacker/vnfm/infra_drivers/kubernetes/k8s/translate_outputs.py", line 452, in _init_k8s_obj
    rely_obj = eval(\'client.\' + obj_name + \'()\')
  File "<string>", line 1, in <module>
', "AttributeError: module 'kubernetes.client' has no attribute 'object'", '
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/stack/tacker/tacker/vnflcm/vnflcm_driver.py", line 341, in _instantiate_vnf
    instance_id = self._vnf_manager.invoke(
  File "/opt/stack/tacker/tacker/common/driver_manager.py", line 71, in invoke
    return getattr(driver, method_name)(**kwargs)
  File "/opt/stack/tacker/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py", line 1279, in instantiate_vnf
    k8s_objs = transformer.\\
  File "/opt/stack/tacker/tacker/vnfm/infra_drivers/kubernetes/k8s/translate_outputs.py", line 317, in get_k8s_objs_from_yaml
    raise exceptions.InitApiFalse(error=msg)
tacker.common.exceptions.InitApiFalse: Failed to init resource.
']: tacker.common.exceptions.VnfInstantiationFailed: Vnf instantiation failed for vnf 1b56aa3e-1495-4bd4-a080-eda8ead2007f, error: Failed to init resource.

```

[Naoaki Horie (naoaki-horie)]

This issue seems to have occurred due to used the Kubernetes Python Client v12.0.0.
As below, in V1ControllerRevision modules, a 'data' key for openapi_types is setting a 'RuntimeRawExtension' resource in v11.0.0, but it is setting a 'object' instead of 'RuntimeRawExtension' in v12.0.0.
The current tacker seems to be assumes that the kubernetes resource is set [1]. so, I think it was outputed "AttributeError: module 'kubernetes.client' has no attribute 'object'" in tacker-conductor.log.

* v11.0.0:
-----
    openapi_types = {
        'api_version': 'str',
        'data': 'RuntimeRawExtension', *
        'kind': 'str',
        'metadata': 'V1ObjectMeta',
        'revision': 'int'
    }
-----
https://github.com/kubernetes-client/python/blob/v11.0.0/kubernetes/client/models/v1_controller_revision.py

* v12.0.0:
-----
    openapi_types = {
        'api_version': 'str',
        'data': 'object', * The value changed
        'kind': 'str',
        'metadata': 'V1ObjectMeta',
        'revision': 'int'
    }
-----
https://github.com/kubernetes-client/python/blob/v12.0.0/kubernetes/client/models/v1_controller_revision.py

[1] https://github.com/openstack/tacker/blob/master/tacker/vnfm/infra_drivers/kubernetes/k8s/translate_outputs.py#L444

[Yasufumi Ogawa (yasufum)]

Fixed: https://review.opendev.org/c/openstack/tacker/+/774215

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/tacker/+/812625