rhui-manager command fails with an "urllib3.exceptions.NewConnectionError" after upgrading from RHUI 4.0 to RHUI 4.1

Issue

• The rhui-manager command fails after upgrading from RHUI 4.0 to RHUI 4.1, as shown below,

  Traceback (most recent call last):
    File "/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen
      chunked=chunked)
    File "/usr/lib/python3.6/site-packages/urllib3/connectionpool.py", line 354, in _make_request
      conn.request(method, url, **httplib_request_kw)
    File "/usr/lib64/python3.6/http/client.py", line 1273, in request
      self._send_request(method, url, body, headers, encode_chunked)
    File "/usr/lib64/python3.6/http/client.py", line 1319, in _send_request
      self.endheaders(body, encode_chunked=encode_chunked)
    File "/usr/lib64/python3.6/http/client.py", line 1268, in endheaders
      self._send_output(message_body, encode_chunked=encode_chunked)
    File "/usr/lib64/python3.6/http/client.py", line 1044, in _send_output
      self.send(msg)
    File "/usr/lib64/python3.6/http/client.py", line 982, in send
      self.connect()
    File "/usr/lib/python3.6/site-packages/urllib3/connection.py", line 184, in connect
      conn = self._new_conn()
    File "/usr/lib/python3.6/site-packages/urllib3/connection.py", line 171, in _new_conn
      self, "Failed to establish a new connection: %s" % e)
  urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7fdc6d62ca20>: Failed to establish a new connection: [Errno 111] Connection refused