Send files to guest using vmtools

If the guest machine has vmware tools installed ansible can now send files to the guest directly via vsphere.

```
- vsphere_guest:
    vcenter_hostname: vcenter.mydomain.local
    username: myuser
    password: mypass
    guest: newvm001
    send: yes
    src_file: /path/to/local/file
    dst_file: /path/on/guest
    overwrite: no
    guest_user: guestadmin
    guest_passwd: supersecret
```