##### 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'
```

if vm_power not in cacheable_results:
                        cacheable_results[vm_power] = {'hosts': []}
                        self.inventory.add_group(vm_power)
                    cacheable_results[vm_power]['hosts'].append(current_host)
                    self.inventory.add_child(vm_power, current_host)
                    
                    vm_guest_id = vm_obj.obj.config.guestId
                    if vm_guest_id and vm_guest_id not in cacheable_results:
                        cacheable_results[vm_guest_id] = {'hosts': []}
                        self.inventory.add_group(vm_guest_id)
                    cacheable_results[vm_guest_id]['hosts'].append(current_host)
                    self.inventory.add_child(vm_guest_id, current_host)
        for host in hostvars:
            h = self.inventory.get_host(host)
            cacheable_results['_meta']['hostvars'][h.name] = h.vars
        return cacheable_results
    def _populate_host_properties(self, vm_obj, current_host):
        
        vm_properties = self.get_option('properties') or []
        field_mgr = self.pyv.content.customFieldsManager.field
        for vm_prop in vm_properties:
            if vm_prop == 'customValue':
                for cust_value in vm_obj.obj.customValue:
                    self.inventory.set_variable(current_host,
                                                [y.name for y in field_mgr if y.key == cust_value.key][0],
                                                cust_value.value)
            else:
                vm_value = self.pyv._get_object_prop(vm_obj.obj, vm_prop.split("."))
                self.inventory.set_variable(current_host, vm_prop, vm_value)