##### 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'
```

property_spec = vmodl.query.PropertyCollector.PropertySpec(
            type=vim_type,  
            all=False,
            pathSet=properties
        )
        
        object_spec = vmodl.query.PropertyCollector.ObjectSpec(
            obj=mor,
            skip=True,
            selectSet=[traversal_spec]
        )
        
        filter_spec = vmodl.query.PropertyCollector.FilterSpec(
            objectSet=[object_spec],
            propSet=[property_spec],
            reportMissingObjectsInResults=False
        )
        return self.content.propertyCollector.RetrieveContents([filter_spec])
    @staticmethod
    def _get_object_prop(vm, attributes):
        """Safely get a property or return None"""
        result = vm
        for attribute in attributes:
            try:
                result = getattr(result, attribute)
            except (AttributeError, IndexError):
                return None
        return result
class InventoryModule(BaseInventoryPlugin, Cacheable):