##### SUMMARY

In the Kubernetes collection's CI tests, the sanity check, which uses `ansible-test sanity --docker -v --color --python 3.6`, started failing with the following error:

```
ERROR: Command "importer.py" returned exit status 1.
>>> Standard Error
Traceback (most recent call last):
  File "/root/ansible/ansible_collections/community/kubernetes/tests/output/.tmp/sanity/import/minimal-py36/bin/importer.py", line 447, in <module>
    main()
  File "/root/ansible/ansible_collections/community/kubernetes/tests/output/.tmp/sanity/import/minimal-py36/bin/importer.py", line 51, in main
    from ansible.utils.collection_loader import AnsibleCollectionLoader
  File "/root/ansible/lib/ansible/utils/collection_loader.py", line 15, in <module>
    from ansible import constants as C
  File "/root/ansible/lib/ansible/constants.py", line 12, in <module>
    from jinja2 import Template
ModuleNotFoundError: No module named 'jinja2'
```

Nothing in the collection has changed in the past week, and no runs failed until this morning's CI run, so it seems something committed to ansible/ansible `devel` has caused this failure.

##### ISSUE TYPE

- Bug Report

##### COMPONENT NAME

ansible-test

##### ANSIBLE VERSION

devel (as of this morning)

##### CONFIGURATION

N/A - defaults

##### OS / ENVIRONMENT

Linux

##### STEPS TO REPRODUCE

  1. Clone kubernetes collection repo
  2. Install Ansible @ devel
  3. Run `ansible-test sanity --docker -v --color --python 3.6`

##### EXPECTED RESULTS

Tests should pass, as they have for the past few weeks.

##### ACTUAL RESULTS

Test fail, with the message in this issue's summary.
raise AnsibleError("%s %s missing documentation (or could not parse"
                                       " documentation): %s\n" %
                                       (plugin_type, plugin, to_native(e)))
                if not doc:
                    
                    continue
                plugin_docs[plugin] = {'doc': doc, 'examples': plainexamples,
                                       'return': returndocs, 'metadata': metadata}
            if do_json:
                
                for plugin, doc_data in plugin_docs.items():
                    try:
                        doc_data['return'] = yaml.load(doc_data['return'])
                    except Exception:
                        pass
                jdump(plugin_docs)
            else:
                
                text = []
                for plugin, doc_data in plugin_docs.items():
                    textret = DocCLI.format_plugin_doc(plugin, plugin_type,
                                                       doc_data['doc'], doc_data['examples'],
                                                       doc_data['return'], doc_data['metadata'])
                    if textret:
                        text.append(textret)
                if text:
                    DocCLI.pager(''.join(text))
        return 0
    @staticmethod
    def get_all_plugins_of_type(plugin_type):