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##### SUMMARY
<!--- Explain the problem briefly below -->
vmware_guest throws error that vmdk already exists although it does not. It is created during running the module but somehow fails. 

pyvmomi-6.7.1.2018.12

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
vmware_guest

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
2.8.1
```

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml
- name: Create new VM
  vmware_guest:
    hostname: "{{ vcenter_hostname }}"
    esxi_hostname: "{{ esxi_host }}"
    username: '{{domain_user}}'
    password: "{{ domain_user_password }}"
    validate_certs: False
    datacenter: TM
    name: "{{ vm_hostname }}"
    folder: "{{ vm_destination }}"      
    state: poweredon
    disk:
    - size_gb: '{{ disk_size }}'
      type: thin
      autoselect_datastore: True
    hardware:
      memory_mb: "{{ memory }}"
      num_cpus: "{{ cores }}"
      num_cpu_cores_per_socket: "{{ cores }}"
    networks:
    - name: LAN
      domain: "{{ domain }}"
      dns_servers:
      -  "{{ dns1 }}"
      -  "{{ dns2 }}"
      type: static
      ip: "{{ ip }}"
      netmask: 255.255.254.0
      gateway: 192.168.1.5
    customization:
      autologon: True
      hostname: "{{ vm_hostname }}"
      domain: "{{ domain }}"
      password: vagrant
      domainadmin: "{{ domain_user }}"
      domainadminpassword: "{{ domain_user_password }}"
      joindomain: "{{ domain }}"
      timezone: 105
      runonce:
      - powershell.exe -ExecutionPolicy Unrestricted -File C:\StartupScripts\ConfigureRemotingForAnsible.ps1 -ForceNewSSLCert -EnableCredSSP
      - powershell.exe -ExecutionPolicy Unrestricted -File C:\StartupScripts\DisableFirewall.ps1 
    wait_for_customization: yes
    template: "{{ vm_template }}"
    wait_for_ip_address: yes
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
Should just create the VM.

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below
Failed to create a virtual machine : Cannot complete the operation because the file or folder [EL02] ********/********.vmdk already exists"
```

- '     - C(independent_nonpersistent): Changes to virtual disk are made to a redo log and discarded at power off, but not affected by snapshots.'
  cdrom:
    description:
    - A CD-ROM configuration for the virtual machine.
    - 'Valid attributes are:'
    - ' - C(type) (string): The type of CD-ROM, valid options are C(none), C(client) or C(iso). With C(none) the CD-ROM will be disconnected but present.'
    - ' - C(iso_path) (string): The datastore path to the ISO file to use, in the form of C([datastore1] path/to/file.iso). Required if type is set C(iso).'
    version_added: '2.5'
  resource_pool:
    description:
    - Use the given resource pool for virtual machine operation.
    - This parameter is case sensitive.
    - Resource pool should be child of the selected host parent.
    version_added: '2.3'
  wait_for_ip_address:
    description:
    - Wait until vCenter detects an IP address for the virtual machine.
    - This requires vmware-tools (vmtoolsd) to properly work after creation.
    - "vmware-tools needs to be installed on the given virtual machine in order to work with this parameter."
    default: 'no'
    type: bool
  wait_for_customization:
    description:
    - Wait until vCenter detects all guest customizations as successfully completed.
    - When enabled, the VM will automatically be powered on.
    default: 'no'
    type: bool
    version_added: '2.8'
  state_change_timeout:
    description: