<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### 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

```

total_bytes_to_write = vm_obj.summary.storage.committed
            if total_bytes_to_write == 0:
                http_nfc_lease.HttpNfcLeaseAbort()
                self.module.fail_json(msg='Total storage space occupied by the VM is 0.')
        headers = {'Accept': 'application/x-vnd.vmware-streamVmdk'}
        cookies = connect.GetStub().cookie
        if cookies:
            headers['Cookie'] = cookies
        lease_updater.start()
        try:
            while True:
                if http_nfc_lease.state == vim.HttpNfcLease.State.ready:
                    for deviceUrl in http_nfc_lease.info.deviceUrl:
                        file_download = False
                        if deviceUrl.targetId and deviceUrl.disk:
                            file_download = True
                        elif deviceUrl.url.split('/')[-1].split('.')[-1] == 'iso':
                            if export_with_iso:
                                file_download = True
                        elif deviceUrl.url.split('/')[-1].split('.')[-1] == 'nvram':
                            if self.host_version_at_least(version=(6, 7, 0), vm_obj=vm_obj):
                                file_download = True
                        else:
                            continue
                        device_file_name = deviceUrl.url.split('/')[-1]
                        
                        if device_file_name.split('.')[0][0:5] == "disk-":
                            device_file_name = device_file_name.replace('disk', vm_obj.name)
                        temp_target_disk = os.path.join(self.ovf_dir, device_file_name)
                        device_url = deviceUrl.url