The insights-client command gives error 'Failed to update rules, Error Invalid IPv6 URL'

Issue

• The insights-client command fails with following error:

  Fatal error
  Traceback (most recent call last):
   File "/etc/insights-client/rpm.egg/insights/client/phase/v1.py", line 33, in _f
     func(client, config)
   File "/etc/insights-client/rpm.egg/insights/client/phase/v1.py", line 94, in pre_update
     rc = client.test_connection()
   File "/etc/insights-client/rpm.egg/insights/client/__init__.py", line 69, in _init_connection
     return func(self, *args, **kwargs)
   File "/etc/insights-client/rpm.egg/insights/client/__init__.py", line 87, in test_connection
     return self.connection.test_connection()
   File "/etc/insights-client/rpm.egg/insights/client/connection.py", line 397, in test_connection
     upload_success = self._test_urls(self.upload_url, "POST")
   File "/etc/insights-client/rpm.egg/insights/client/connection.py", line 363, in _test_urls
     return self._legacy_test_urls(url, method)
   File "/etc/insights-client/rpm.egg/insights/client/connection.py", line 339, in _legacy_test_urls
     test_req = self.post(test_url + ext, data=test_flag)
   File "/etc/insights-client/rpm.egg/insights/client/connection.py", line 189, in post
     return self._http_request(url, 'POST', **kwargs)
   File "/etc/insights-client/rpm.egg/insights/client/connection.py", line 173, in _http_request
     res = self.session.request(url=url, method=method, timeout=self.config.http_timeout, **kwargs)
   File "/usr/lib/python3.6/site-packages/requests/sessions.py", line 535, in request
     resp = self.send(prep, **send_kwargs)
   File "/usr/lib/python3.6/site-packages/requests/sessions.py", line 648, in send
     r = adapter.send(request, **kwargs)
   File "/usr/lib/python3.6/site-packages/requests/adapters.py", line 412, in send
     conn = self.get_connection(request.url, proxies)
   File "/usr/lib/python3.6/site-packages/requests/adapters.py", line 304, in get_connection
  proxy = prepend_scheme_if_needed(proxy, 'http')
   File "/usr/lib/python3.6/site-packages/requests/utils.py", line 895, in prepend_scheme_if_needed
     scheme, netloc, path, params, query, fragment = urlparse(url, new_scheme)
   File "/usr/lib64/python3.6/urllib/parse.py", line 380, in urlparse
     splitresult = urlsplit(url, scheme, allow_fragments)
   File "/usr/lib64/python3.6/urllib/parse.py", line 459, in urlsplit
     raise ValueError("Invalid IPv6 URL")
  ValueError: Invalid IPv6 URL