##### 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.
filename = loader.find_plugin(plugin, mod_type='.py', ignore_deprecated=True, check_aliases=True)
        if filename is None:
            raise PluginNotFound('%s was not found in %s' % (plugin, search_paths))
        doc, plainexamples, returndocs, metadata = get_docstring(filename, fragment_loader, verbose=(context.CLIARGS['verbosity'] > 0))
        
        
        if doc is None:
            
            
            if 'status' in metadata and isinstance(metadata['status'], Container):
                if 'removed' in metadata['status']:
                    raise RemovedPlugin('%s has been removed' % plugin)
                
                
                return {}, {}, {}, metadata
            else:
                
                display.warning(u'%s has an invalid ANSIBLE_METADATA field' % plugin)
            raise ValueError('%s did not contain a DOCUMENTATION attribute' % plugin)
        doc['filename'] = filename
        return doc, plainexamples, returndocs, metadata
    @staticmethod
    def format_plugin_doc(plugin, plugin_type, doc, plainexamples, returndocs, metadata):