<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
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##### SUMMARY
<!--- Explain the problem briefly below -->
If target VM has big disk file, exporting to ovf will timeout in 10 minutes. 
"timeout" can be set as a module parameter to let user set the timeout value for different scenarios.
##### 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_export_ovf
##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.8.1
  config file = /root/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.15rc1 (default, Nov 12 2018, 14:31:15) [GCC 7.3.0]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->


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

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

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

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
VM can be exported.

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
Timeout occurred.
<!--- Paste verbatim command output between quotes -->
```paste below

```

if '*' in device_url:
                            device_url = device_url.replace('*', self.params['hostname'])
                        if file_download:
                            current_bytes_written = self.download_device_files(headers=headers,
                                                                               temp_target_disk=temp_target_disk,
                                                                               device_url=device_url,
                                                                               lease_updater=lease_updater,
                                                                               total_bytes_written=total_bytes_written,
                                                                               total_bytes_to_write=total_bytes_to_write)
                            total_bytes_written += current_bytes_written
                            ovf_file = vim.OvfManager.OvfFile()
                            ovf_file.deviceId = deviceUrl.key
                            ovf_file.path = device_file_name
                            ovf_file.size = current_bytes_written
                            ovf_files.append(ovf_file)
                    break
                elif http_nfc_lease.state == vim.HttpNfcLease.State.initializing:
                    sleep(2)
                    continue
                elif http_nfc_lease.state == vim.HttpNfcLease.State.error:
                    lease_updater.stop()
                    self.module.fail_json(msg='Get HTTP NFC lease error %s.' % http_nfc_lease.state.error[0].fault)
            
            ovf_manager = self.content.ovfManager
            ovf_descriptor_name = vm_obj.name
            ovf_parameters = vim.OvfManager.CreateDescriptorParams()
            ovf_parameters.name = ovf_descriptor_name
            ovf_parameters.ovfFiles = ovf_files