Description of problem:
Observed that "default" button on the subscription-manager-gui doesnot reset the prot and prefix details . This appears to be working on the rhel68 subscription manager subscription-manager: 1.16.8-8.el6
python-rhsm: 1.16.6-1

Version-Release number of selected component (if applicable):
subscription-manager: 1.17.5-1.git.0.9f499d8.el7
python-rhsm: 1.17.1-1.git.1.323232f.el7


How reproducible:
3/3

Steps to Reproduce:
1.configure server details to a different value
 
ex: subscription-manager config --server.hostname=test-candlepin-server.usersys.redhat.com --server.prefix=/candlepin --server.port=8443

2.now launch subscription-manage-gui --> Register button
3.click on default button

Actual results:
Observed that "subscription.rhsm.redhat.com" was displayed on the url , however on click "Next" , unable to reach server message displayed (PFA) , in the error message the port and prefix details was the details set at step 1 

Expected results:
should reset the hostname, port , prefix details 

Additional info:
log details 
--------------
2016-04-25 16:22:08,776 [INFO] subscription-manager-gui:14552 @connection.py:815 - Connection built: host=test-candlepin-server.usersys.redhat.com port=8443 handler=/candlepin auth=identity_cert ca_dir=/etc/rhsm/ca/ verify=False
2016-04-25 16:22:09,256 [INFO] rhsmd:14593 @rhsmd:235 - rhsmd started
2016-04-25 16:22:22,981 [INFO] subscription-manager-gui:14552 @connection.py:815 - Connection built: host=subscription.rhsm.redhat.com port=8443 handler=/candlepin auth=none
2016-04-25 16:22:23,217 [ERROR] subscription-manager-gui:14552 @utils.py:159 - [Errno 111] Connection refused
Traceback (most recent call last):
  File "/usr/share/rhsm/subscription_manager/utils.py", line 144, in is_valid_server_info
    conn.ping()
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 876, in ping
    return self.conn.request_get("/status/")
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 681, in request_get
    return self._request("GET", method)
  File "/usr/lib64/python2.7/site-packages/rhsm/connection.py", line 571, in _request
    conn.request(request_type, handler, body=body, headers=headers)
  File "/usr/lib64/python2.7/httplib.py", line 979, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib64/python2.7/httplib.py", line 1013, in _send_request
    self.endheaders(body)
  File "/usr/lib64/python2.7/httplib.py", line 975, in endheaders
    self._send_output(message_body)
  File "/usr/lib64/python2.7/httplib.py", line 835, in _send_output
    self.send(msg)
  File "/usr/lib64/python2.7/httplib.py", line 797, in send
    self.connect()
  File "/usr/lib64/python2.7/site-packages/M2Crypto/httpslib.py", line 73, in connect
    raise error
error: [Errno 111] Connection refused
2016-04-25 16:22:23,219 [ERROR] subscription-manager-gui:14552 @registergui.py:780 - registration error: Unable to reach the server at subscription.rhsm.redhat.com:8443/candlepin