Created attachment 1195424 [details]
screenshot when omiting the discovery port number in the server url

Description of problem:

If one omits the discovery port (normally 9090) in the 'Server URL' prompt, the wizard TUI loops back to the first dialog. It is kinda confusing. 
An actual error is issued, but on another virtual terminal.

Version-Release number of selected component (if applicable):
 * Sat 6.1.2
 * foreman-discovery-image-3.1.1-16.el7sat.noarch

How reproducible:
Always


Steps to Reproduce:
1. boot with the iso foreman-discovery-image-3.1.1-16.el7sat
2. select nic, select static, setup the network
3. enter the server url (without appending the port number to the url)
4. select proxy
5. the TUI begins anew.


Actual results:

If one enters for the 'Server URL' : "https://sixthsat1.example.com" (instead of the correct: https://sixthsat1.example.com:9090)
It does neither succeeds nor fails, at least for the wizard TUI.
On another virtual terminal, an actual error can be seen.
On the current VT, the wizard TUI starts again, but no error message was shown.


Expected results:

The TUI wizard sould improve/add validation for the 'Server URL' field, and check for the PORT number.

Is the discovery service port mandatort? If so, it must be checked before trying to connect to the Satellite Capsule.

Cheers.