<!--- 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

```

self.module.fail_json(msg='Getting %s return code %d' % (device_url, response.getcode()))
                current_bytes_written = 0
                block = response.read(self.chunk_size)
                while block:
                    handle.write(block)
                    sha256_hash.update(block)
                    handle.flush()
                    os.fsync(handle.fileno())
                    current_bytes_written += len(block)
                    block = response.read(self.chunk_size)
                written_percent = ((current_bytes_written + total_bytes_written) * 100) / total_bytes_to_write
                lease_updater.progressPercent = int(written_percent)
            mf_handle.write(mf_content + sha256_hash.hexdigest() + '\n')
        self.facts['device_files'].append(temp_target_disk)
        return current_bytes_written
    def export_to_ovf_files(self, vm_obj):
        self.create_export_dir(vm_obj=vm_obj)
        export_with_iso = False
        if 'export_with_images' in self.params and self.params['export_with_images']:
            export_with_iso = True
        ovf_files = []
        
        http_nfc_lease = vm_obj.ExportVm()
        
        lease_updater = LeaseProgressUpdater(http_nfc_lease, self.lease_interval)
        total_bytes_written = 0
        
        total_bytes_to_write = vm_obj.summary.storage.unshared
        
        if total_bytes_to_write == 0: