##### SUMMARY
The vmware_vm_inventory plugin cannot verify the inventory file when being loaded via the auto plugin

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
lib/ansible/plugins/inventory/vmware_vm_inventory.py

##### ANSIBLE VERSION
```paste below
ansible 2.8.1
  config file = None
  configured module search path = ['/Users/wtome/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/Cellar/ansible/2.8.1_1/libexec/lib/python3.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.7.4 (default, Sep  7 2019, 18:27:02) [Clang 10.0.1 (clang-1001.0.46.4)]
```

##### CONFIGURATION
```paste below

```

##### OS / ENVIRONMENT
MacOS 10.14.6


##### STEPS TO REPRODUCE
vmware_vm_inventory.yaml
```yaml
---
plugin: vmware_vm_inventory
strict: True
```

##### EXPECTED RESULTS
Inventory should be parsed from vCenter

##### ACTUAL RESULTS
```paste below
ansible-inventory -i vmware_vm_inventory.yaml --playbook-dir=. --list
 [WARNING]:  * Failed to parse /Users/wtome/ansible-
inventory/tests/vmware_vm_inventory.yaml with auto plugin: inventory config
'/Users/wtome/ansible-
inventory/tests/vmware_vm_inventory.yaml' could not be verified by plugin
'vmware_vm_inventory'
```

""" Populate cache using source data """
        hostvars = source_data.pop('_meta', {}).get('hostvars', {})
        for group in source_data:
            if group == 'all':
                continue
            else:
                self.inventory.add_group(group)
                hosts = source_data[group].get('hosts', [])
                for host in hosts:
                    self._populate_host_vars([host], hostvars.get(host, {}), group)
                self.inventory.add_child('all', group)
    def _populate_from_source(self, source_data, using_current_cache):
        """
        Populate inventory data from direct source
        """
        if using_current_cache:
            self._populate_from_cache(source_data)
            return source_data
        cacheable_results = {'_meta': {'hostvars': {}}}
        hostvars = {}
        objects = self.pyv._get_managed_objects_properties(vim_type=vim.VirtualMachine,
                                                           properties=['name'])
        if self.pyv.with_tags:
            tag_svc = self.pyv.rest_content.tagging.Tag
            tag_association = self.pyv.rest_content.tagging.TagAssociation
            tags_info = dict()
            tags = tag_svc.list()
            for tag in tags:
                tag_obj = tag_svc.get(tag)
                tags_info[tag_obj.id] = tag_obj.name