<!--- 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

```

delegate_to: localhost
'''
RETURN = r'''
instance:
    description: list of the exported files, if exported from vCenter server, device file is not named with vm name
    returned: always
    type: dict
    sample: None
'''
import os
import hashlib
from time import sleep
from threading import Thread
from ansible.module_utils.urls import open_url
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils._text import to_text
from ansible.module_utils.vmware import vmware_argument_spec, PyVmomi
try:
    from pyVmomi import vim
    from pyVim import connect
except ImportError:
    pass
class LeaseProgressUpdater(Thread):
    def __init__(self, http_nfc_lease, update_interval):
        Thread.__init__(self)
        self._running = True
        self.httpNfcLease = http_nfc_lease
        self.updateInterval = update_interval
        self.progressPercent = 0
    def set_progress_percent(self, progress_percent):