virt-who エラー Virt backend 'config' fails with exception:#012ReadTimeout: HTTPSConnectionPool が発生する

Issue

• vCenter からの応答を待っている時に virt-who でタイムアウトの時間を長くするにはどうすれば良いですか?
  タイムアウトエラーが発生し、virt-who でホストからゲストへのマッピングがアップデートされません。

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
:

• virt-who サービスを再起動すると、以下のメッセージが発生します。

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='192.168.123.13', port=443): Read timed out.(read timeout=60)