backport support for python-kubernetes v12 to ansible 2.9 (#72792)

Support for using python-kubernetes v12 has been added to the
new upstream repo:
https://github.com/ansible-collections/community.kubernetes/blob/main/plugins/module_utils/common.py#L256-L261
This PR backports that support to ansible 2.9

changelogs/fragments/k8s-support-kubernetes-v12.yml

@@ -0,0 +1,3 @@
+bugfixes:
+  - k8s - add support for python-kubernetes v12 and later - backport of
+    support in community.kubernetes

lib/ansible/module_utils/k8s/common.py

@@ -188,7 +188,12 @@ class K8sAnsibleMixin(object):
                 kubernetes.config.load_kube_config(auth.get('kubeconfig'), auth.get('context'))
 
         # Override any values in the default configuration with Ansible parameters
-        configuration = kubernetes.client.Configuration()
+        # As of kubernetes-client v12.0.0, get_default_copy() is required here
+        try:
+            configuration = kubernetes.client.Configuration().get_default_copy()
+        except AttributeError:
+            configuration = kubernetes.client.Configuration()
+
         for key, value in iteritems(auth):
             if key in AUTH_ARG_MAP.keys() and value is not None:
                 if key == 'api_key':

test/integration/targets/k8s/tasks/basic_validation.yml

@@ -0,0 +1,8 @@
+---
+
+# just test that authentication works
+- name: Ensure testing1 namespace exists
+  k8s:
+    api_version: v1
+    kind: Namespace
+    name: testing1

test/integration/targets/k8s/tasks/main.yml

@@ -65,6 +65,40 @@
     recreate_crd_default_merge_expectation: recreate_crd is failed
     playbook_namespace: ansible-test-k8s-older-openshift
 
+- file:
+    path: "{{ virtualenv }}"
+    state: absent
+  no_log: yes
+
+# Test works with kubernetes==11.* and kubernetes>11
+
+- pip:
+    name:
+      - openshift
+      - kubernetes==11.*
+      - coverage
+    virtualenv: "{{ virtualenv }}"
+    virtualenv_command: "{{ virtualenv_command }}"
+    virtualenv_site_packages: no
+
+- include_tasks: basic_validation.yml
+
+- file:
+    path: "{{ virtualenv }}"
+    state: absent
+  no_log: yes
+
+- pip:
+    name:
+      - openshift
+      - kubernetes>11
+      - coverage
+    virtualenv: "{{ virtualenv }}"
+    virtualenv_command: "{{ virtualenv_command }}"
+    virtualenv_site_packages: no
+
+- include_tasks: basic_validation.yml
+
 - file:
     path: "{{ virtualenv }}"
     state: absent