### Summary

Since dnf is not installing the packages when running `dnf download --downloadonly...`, it does not require root access to pull down the rpms. It would be nice if ansible followed the same pattern.

### Issue Type

Feature Idea

### Component Name

dnf

### Additional Information

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)
    - name: Download RPM's
      dnf:
        name: "{{ item }}"
        state: present
        download_only: yes
        download_dir: "{{ rpms_path }}"
      loop: "{{ rpms }}"
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
#
    
    
    
    
    
    
    
    
    yumdnf_argument_spec['argument_spec']['allowerasing'] = dict(default=False, type='bool')
    yumdnf_argument_spec['argument_spec']['nobest'] = dict(default=False, type='bool')
    module = AnsibleModule(
        **yumdnf_argument_spec
    )
    module_implementation = DnfModule(module)
    try:
        module_implementation.run()
    except dnf.exceptions.RepoError as de:
        module.fail_json(
            msg="Failed to synchronize repodata: {0}".format(to_native(de)),
            rc=1,
            results=[],
            changed=False
        )
if __name__ == '__main__':
    main()