virt-who error - Virt backend 'config' fails with exception:#012ReadTimeout: HTTPSConnectionPool

Issue

• How to increase the time-out in virt-who when is waiting to get response from vCenter ?
  Timeout error and virt-who is not updating hosts-to-guests mapping:

  2017-06-11 08:16:42,218 [virtwho.config DEBUG] esx(21182):MainThread @esx.py:_prepare:58 - Creating ESX event filter
  2017-06-11 08:16:42,218 [virtwho.config DEBUG] esx(21182):MainThread @esx.py:_run:102 - Wait for ESX event finished, timeout
  :
  

• Restarting virt-who service shows:

  2017-06-11 08:20:50,123 [virtwho.config ERROR] esx(19763):MainThread @virt.py:run:379 - Virt backend 'config' fails with exception:
  Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/virtwho/virt/virt.py", line 372, in run
      self._run()
    File "/usr/lib/python2.7/site-packages/virtwho/virt/esx/esx.py", line 175, in _run
      options=options)
    File "/usr/lib/python2.7/site-packages/suds/client.py", line 542, in __call__
      return client.invoke(args, kwargs)
    File "/usr/lib/python2.7/site-packages/suds/client.py", line 602, in invoke
      result = self.send(soapenv)
    File "/usr/lib/python2.7/site-packages/suds/client.py", line 641, in send
      reply = transport.send(request)
    File "/usr/lib/python2.7/site-packages/virtwho/virt/esx/esx.py", line 96, in send
      verify=False
    File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 507, in post
      return self.request('POST', url, data=data, json=json, **kwargs)
    File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 464, in request
      resp = self.send(prep, **send_kwargs)
    File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 576, in send
      r = adapter.send(request, **kwargs)
   File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 433, in send
      raise ReadTimeout(e, request=request)
  ReadTimeout: HTTPSConnectionPool(host='192.168.XXX.XX', port=443): Read timed out. (read timeout=60)