##### 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'
```

description: Name of vCenter or ESXi server.
            required: True
            env:
              - name: VMWARE_SERVER
        username:
            description: Name of vSphere admin user.
            required: True
            env:
              - name: VMWARE_USERNAME
        password:
            description: Password of vSphere admin user.
            required: True
            env:
              - name: VMWARE_PASSWORD
        port:
            description: Port number used to connect to vCenter or ESXi Server.
            default: 443
            env:
              - name: VMWARE_PORT
        validate_certs:
            description:
            - Allows connection when SSL certificates are not valid. Set to C(false) when certificates are not trusted.
            default: True
            type: boolean
        with_tags:
            description:
            - Include tags and associated virtual machines.
            - Requires 'vSphere Automation SDK' library to be installed on the given controller machine.
            - Please refer following URLs for installation steps
            - 'https://code.vmware.com/web/sdk/65/vsphere-automation-python'