Description of problem:

  Given registering a system "RHEL6.8 Snapshot4-1 variant Server" using proxy
  Firstboot connects throught a non auth proxy even "use credentials" is checked on.

  This is a little confusing since it opens a space to make inconsistent settings.
  I (as a customer) wanted to use credentials for proxy but
  I entered wrong proxy url (ie. no auth proxy).
 
  And the program did not inform me about this inconsistency.


Version-Release number of selected component (if applicable):

   RHEL6.8 Snapshot4-1 Server variant

How reproducible:

   everytime

Steps to Reproduce:

   Given Firstboot running at RHEL6.8 Snapshot4-1 - variant Server
   When I clicked "Proxy Setup" at "Choose Service"
   then proxy dialog appeared.

   When I checked "I would like to connect via HTTP proxy"
   and I filled "Proxy Location" using value for non auth proxy (auto-services.usersys.redhat.com:3129)
   and I checked "Use Authentication with HTTP Proxy"
   and I filled  wrong/right credentials
   and I clicked "Close"
   then a dialog was closed.

   When I clicked "Forward"
   and I clicked "Forward" again
   then a program connected throught a proxy even I checked "Use Authentication with HTTP Proxy" and filled credentials.


Actual results:

   Program ignores an inconsistency of values entered in Proxy Dialog.

Expected results:

   Program could inform me that I entered an url of a non auth proxy and I checked that I want to use authorization for proxy.